.jpg "Voltaren Gel Side Effects")
All medicines and other substances that have a physiological effect when ingested or introduced into the body have side effects, and Voltaren Gel enters into this category. In this article, we will review Voltaren Gel secondary and typical undesirable effects in a comprehensible fashion. If you want to purchase, see how much Voltaren costs.
As an introductory note, we should point out the importance of getting medical help in case you experience any side effects, as your professional healthcare provider will know what to do.
Table Of Contents:
- INDICATIONS AND USAGE
- DOSAGE AND ADMINISTRATION
- DOSAGE FORMS AND STRENGTHS
- CONTRAINDICATIONS
- WARNINGS AND PRECAUTIONS
- Cardiovascolar Thrombotic Events
- Gastrointestinal Effects
- Hepatic Effects
- Hypertension
- Congestive Heart Failure and Edema
- Renal Effects
- Anaphylactoid Reactions
- Skin Reactions
- Pregnancy
- Corticosteroid Treatment
- Inflammation
- Hematological Effects
- Preexisting Asthma
- Sun Exposure
- Eye Exposure
- Laboratory Tests
- ADVERSE REACTIONS
- Clinical Studies Experience
- DRUG INTERACTIONS
- USE IN SPECIFIC POPolATIONS
- OVERDOSAGE
- DESCRIPTION
- CLINICAL PHARMACOLOGY
- NONCLINICAL TOXICOLOGY
- CLINICAL STUDIES
- HOW SUPPLIED/STORAGE AND HANDLING
- PATIENT COUNSELING INFORMATION
1 INDICATIONS AND USAGE
Voltaren Gel is indicated for the relief of the pain of osteoarthritis of joints amenable to topical treatment, such as the knees and those of the hands.
Voltaren Gel has not been evaluated for use on the spine, hip, or shoulder.
2 DOSAGE AND ADMINISTRATION
2.1 Dosing Card
The proper amount of Voltaren Gel should be measured using the dosing card supplied in the drug product carton. The dosing card is made of polypropylene, like the tube cap containing the Voltaren Gel, but without the white colorant. The dosing card should be used for each application of drug product. The gel should be applied within the oblong area of the dosing card up to the 2 gram or 4 gram line (2 g for each elbow, wrist, or hand, and 4 g for each knee, ankle, or foot). The dosing card containing Voltaren Gel can be used to apply the gel. The hands should then be used to gently rub the gel into the skin. After using the dosing card, hold with fingertips, rinse, and dry. If treatment site is the hands, patients should wait at least one (1) hour to wash their hands.
2.2 Lower extremities, including the knees, ankles, and feet
Apply the gel (4 g) to the affected foot or knee or ankle, 4 times daily.
Voltaren Gel should be gently massaged into the skin ensuring application to the entire affected foot or knee or ankle. The entire foot includes the sole, top of the foot and the toes. Do not apply more than 16g daily to any single joint of the lower extremities.
2.3 Upper extremities including the elbows, wrists and hands
Apply the gel (2 g) to the affected hand or elbow or wrist, 4 times daily. Voltaren Gel should be gently massaged into the skin ensuring application to the entire affected hand or elbow or wrist. The entire hand includes the palm, back of the hands, and the fingers. Do not apply more than 8 g daily to any single joint of the upper extremities.
Total dose should not exceed 32 g per day, over all affected joints.
2.4 Special Precautions
Showering/bathing should be avoided for at least 1 hour after the application. Patient should wash his/her hands after use, unless the hands are the treated joint. If Voltaren Gel is applied to the hand(s) for treatment, patient should not wash the treated hand(s) for at least 1 hour after the application.
Voltaren Gel should not be applied to open wounds.
Contact of Voltaren Gel with eyes and mucous membranes should be avoided.
External heat and/or occlusive dressings should not be applied to treated joints.
Exposure of the treated joint(s) to sunlight should be avoided.
Voltaren Gel should not be used concomitantly with sunscreens, cosmetics, lotions, moisturizers, insect repellants, or other topical medications on the same skin sites has not been evaluated.
Concomitant use of Voltaren Gel with oral non-steroidal anti-inflammatory drugs (NSAIDs) has not been evaluated, and may increase adverse NSAIDs effects.
Wearing of clothing or gloves should be avoided for at least 10 minutes after applying Voltaren Gel.
3 DOSAGE FORMS AND STRENGTHS
1% gel
4 CONTRAINDICATIONS
The use of Voltaren Gel is contraindicated in patients with a known hypersensitivity to diclofenac. Voltaren Gel should not be administered in patients who have experienced asthma, urticaria, or other allergic-type reactions after taking aspirin or other NSAIDs. Severe, rarely fatal, anaphylactic-like reactions to NSAIDs have been reported in such patients [see Warnings and Precautions (5.1)].
Voltaren Gel is contraindicated in the setting of coronary artery bypass graft (CABG) surgery [see Warnings and Precautions (5.1)].
5 WARNINGS AND PRECAUTIONS
5.1 Cardiovascular Thrombotic Events
Clinical trials of several COX-2 selective and nonselective NSAIDs of up to three years duration have shown an increased risk of serious cardiovascular (CV) thrombotic events, myocardial infarction, and stroke, which can be fatal. All NSAIDs, both COX-2 selective and nonselective, may have a similar risk. Patients with known CV disease or risk factors for CV disease may be at greater risk. To minimize the potential risk for an adverse CV event in patients treated with NSAIDs, the lowest effective dose should be used for the shortest duration possible. Physicians and patients should remain alert for the development of such events, even in the absence of previous CV symptoms. Patients should be informed about the signs and/or symptoms of serious CV toxicity and the steps to take if they occur.
There is no consistent evidence that concurrent use of aspirin mitigates the increased risk of serious CV thrombotic events associated with NSAIDs use. The concurrent use of aspirin and NSAIDs such as diclofenac, does increase the risk of serious GI events [see Warnings and Precautions (5.2)].
Two large, controlled, clinical trials of a COX-2 selective NSAID for the treatment of pain in the first 10-14 days following CABG surgery found an increased incidence of myocardial infarction and stroke [see Contraindications (4)].
5.2 Gastrointestinal Effects – Risk of GI Ulceration, Bleeding, and Perforation
NSAIDs, including diclofenac, can cause serious gastrointestinal (GI) events including bleeding, ulceration, and perforation of the stomach, small intestine or large intestine, which can be fatal. These serious adverse events can occur at any time, with or without warning symptoms, in patients treated with NSAIDs. Only one in five patients who develop a serious upper GI adverse event on NSAID therapy is symptomatic. Upper GI ulcers, gross bleeding, or perforation caused by NSAIDs occur in approximately 1% of patients treated for 3-6 months, and in about 2-4% of patients treated for one year. These trends continue with longer duration of use, increasing the likelihood of developing a serious GI event at some time during the course of therapy. However, even short-term therapy is not without risk.
NSAIDs should be prescribed with extreme caution in patients with a prior history of ulcer disease or gastrointestinal bleeding. Patients with a prior history of peptic ulcer disease and/or gastrointestinal bleeding who use NSAIDs have a greater than 10-fold increased risk for developing a GI bleed compared to patients with neither of these risk factors. Other factors that increase the risk of GI bleeding in patients treated with NSAIDs include concomitant use of oral corticosteroids or anticoagulants, longer duration of NSAIDs therapy, smoking, use of alcohol, older age, and poor general health status. Most spontaneous reports of fatal GI events are in elderly or debilitated patients and therefore special care should be taken in treating this population.
To minimize the potential risk for an adverse GI event, the lowest effective dose should be used for the shortest possible duration. Physicians and patients should remain alert for signs and symptoms of GI ulceration and bleeding during diclofenac therapy and promptly initiate additional evaluation and treatment if a serious GI adverse event is suspected. For high-risk patients, alternate therapies that do not involve NSAIDs should be considered.
5.3 Hepatic Effects
Elevations of one or more liver tests may occur during therapy with diclofenac sodium. These laboratory abnormalities may progress, may remain unchanged, or may be transient with continued therapy. Borderline elevations (i.e. less than 3 times the ULN [ULN = the upper limit of normal range]) or greater elevations of transaminases occurred in about 15% of diclofenac-treated patients. Of the markers of hepatic function, ALT (SGPT) is recommended for the monitoring of liver injury.
In clinical trials, meaningful elevations (i.e., more than 3 times the ULN) of AST (SGOT) (ALT was not measured in all studies) occurred in about 2% of approximately 5,700 patients at some time during diclofenac treatment. In a large, open-label, controlled trial of 3,700 patients treated for 2-6 months, patients were monitored first at 8 weeks and 1,200 patients were monitored again at 24 weeks. Meaningful elevations of ALT and/or AST occurred in about 4% of patients and included marked elevations (i.e., more than 8 times the ULN) in about 1% of the 3,700 patients. In that open-label study, a higher incidence of borderline (less than 3 times the ULN), moderate (3-8 times the ULN), and marked (>8 times the ULN) elevations of ALT or AST was observed in patients receiving diclofenac when compared to other NSAIDs. Elevations in transaminases were seen more frequently in patients with osteoarthritis than in those with rheumatoid arthritis.
Almost all meaningful elevations in transaminases were detected before patients became symptomatic. Abnormal tests occurred during the first 2 months of therapy with diclofenac in 42 of the 51 patients in all trials who developed marked transaminase elevations.
In postmarketing reports, cases of drug-induced hepatotoxicity have been reported in the first month, and in some cases, the first 2 months of therapy, but can occur at any time during treatment with diclofenac. Postmarketing surveillance has reported cases of severe hepatic reactions, including liver necrosis, jaundice, fulminant hepatitis with and without jaundice, and liver failure. Some of these reported cases resulted in fatalities or liver transplantation.
Physicians should measure transaminases periodically in patients receiving long-term therapy with diclofenac, because severe hepatotoxicity may develop without a prodrome of distinguishing symptoms. The optimum times for making the first and subsequent transaminase measurements are not known. Based on clinical trial data and postmarketing experiences, transaminases should be monitored within 4 to 8 weeks after initiating treatment with diclofenac. However, severe hepatic reactions can occur at any time during treatment with diclofenac.
If abnormal liver tests persist or worsen, if clinical signs and/or symptoms consistent with liver disease develop, or if systemic manifestations occur (e.g., eosinophilia, rash, abdominal pain, diarrhea, dark urine, etc.), diclofenac sodium should be discontinued immediately. To minimize the possibility that hepatic injury will become severe between transaminase measurements, physicians should inform patients of the warning signs and symptoms of hepatotoxicity (e.g., nausea, fatigue, lethargy, diarrhea, pruritus, jaundice, right upper quadrant tenderness, and “flu-like†symptoms), and the appropriate action patients should take if these signs and symptoms appear.
To minimize the potential risk for an adverse liver related event in patients treated with diclofenac sodium, the lowest effective dose should be used for the shortest duration possible. Caution should be exercised in prescribing diclofenac sodium with concomitant drugs that are known to be potentially hepatotoxic (e.g., antibiotics, anti-epileptics).
5.4 Hypertension
NSAIDs, including Voltaren Gel, can lead to the onset of new hypertension or worsening of preexisting hypertension, either of which may contribute to the increased incidence of cardiovascular events. Patients taking thiazides or loop diuretics may have impaired response to these therapies when taking NSAIDs. NSAIDs, including Voltaren Gel should be used with caution in patients with hypertension. Blood pressure should be monitored closely during the initiation of therapy with Voltaren Gel and throughout the course of therapy.
5.5 Congestive Heart Failure and Edema
Fluid retention and edema have been observed in some patients treated with NSAIDs, including Voltaren Gel. Voltaren Gel should be used with caution in patients with fluid retention or heart failure.
5.6 Renal Effects
Long-term administration of NSAIDs has resulted in renal papillary necrosis and other renal injury. Renal toxicity has also been seen in patients in whom renal prostaglandins have a compensatory role in the maintenance of renal perfusion. In these patients, administration of an NSAID may cause a dose-dependent reduction in prostaglandin formation and, secondarily, in renal blood flow, which may precipitate overt renal decompensation. Patients at greatest risk of this reaction are
those with impaired renal function, heart failure, liver dysfunction, those taking diuretics and ACE-inhibitors, and the elderly. Discontinuation of NSAID therapy is usually followed by recovery to the pretreatment state.
No information is available from controlled clinical studies regarding the use of Voltaren Gel inpatients with advanced renal disease. Therefore, treatment with Voltaren Gel is not recommended in patients with advanced renal disease. If Voltaren Gel therapy is initiated, close monitoring of the patient's renal function is advisable.
5.7 Anaphylactoid Reactions
As with other NSAIDs, anaphylactoid reactions may occur in patients without prior exposure to Voltaren Gel. Voltaren Gel should not be given to patients with the aspirin triad. This symptom complex typically occurs in asthmatic patients who experience rhinitis with or without nasal polyps, or who exhibit severe, potentially fatal bronchospasm after taking aspirin or other NSAIDs [see Contraindications (4), Warnings and Precautions (5.7)]. Emergency help should be sought in cases where an anaphylactoid reaction occurs.
5.8 Skin Reactions
NSAIDs, including Voltaren Gel, can cause serious skin adverse events such as exfoliative dermatitis, Stevens-Johnson Syndrome (SJS), and toxic epidermal necrolysis (TEN), which can be fatal. These serious events may occur without warning. Patients should be informed about the signs and symptoms of serious skin manifestations, and the use of the drug should be discontinued at the first appearance of skin rash or any other signs of hypersensitivity.
Voltaren Gel should not be applied to open skin wounds, infections, inflammations, or exfoliative dermatitis, as it may affect absorption and tolerability of the drug. Voltaren Gel should not be allowed to come into contact with the eyes or with mucous membranes.
The effect of Voltaren Gel under occlusive dressings has not been evaluated, and should be avoided.
5.9 Pregnancy
As with other NSAIDs, Voltaren Gel should be avoided in late pregnancy, because it may cause premature closure of the ductus arteriosus.
5.10 Corticosteroid Treatment
Voltaren Gel cannot be expected to substitute for corticosteroids or to treat corticosteroid insufficiency. Abrupt discontinuation of corticosteroids may lead to exacerbation of corticosteroid-responsive illness. Patients on prolonged corticosteroid therapy should have their therapy tapered slowly if a decision is made to discontinue corticosteroids.
5.11 Inflammation
The pharmacological activity of diclofenac in reducing inflammation, and possibly fever, may diminish the utility of these diagnostic signs in detecting infectious complications of presumed noninfectious, painful conditions.
5.12 Hematological Effects
Anemia is sometimes seen in patients receiving NSAIDs. This may be due to fluid retention, occult or gross GI blood loss, or an incompletely described effect upon erythropoeisis. Patients on long-term treatment with NSAIDs, including Voltaren Gel, should have their hemoglobin or hematocrit checked if they exhibit any signs or symptoms of anemia or blood loss.
NSAIDs inhibit platelet aggregation and have been shown to prolong bleeding time in some patients. Unlike aspirin, their effect on platelet function is quantitatively less, of shorter duration, and reversible. Patients treated with Voltaren Gel who may be adversely affected by alteration in platelet function, such as those with coagulation disorders or patients receiving anticoagulants should be carefully monitored.
5.13 Preexisting Asthma
Patients with asthma may have aspirin-sensitive asthma. The use of aspirin in patients with aspirin-sensitive asthma has been associated with severe bronchospasm, which can be fatal. Since cross reactivity, including bronchospasm, between aspirin and other non-steroidal anti-inflammatory drugs has been reported in such aspirin-sensitive patients, Voltaren Gel should not be administered to patients with this form of aspirin sensitivity and should be used with caution in patients with preexisting asthma.
5.14 Sun Exposure
Patients should minimize or avoid exposure to natural or artificial sunlight on treated areas because studies in animals indicated topical diclofenac treatment resulted in an earlier onset of ultraviolet light-induced skin tumors. The potential effects of Voltaren Gel on skin response to ultraviolet damage in humans are not known.
5.15 Eye Exposure
Contact of Voltaren Gel with eyes and mucosa, although not studied, should be avoided. Patients should be advised that if eye contact occurs, they should immediately wash out the eye with water or saline and consult a physician if irritation persists for more than an hour.
5.16 Laboratory Tests
Because serious GI tract ulcerations and bleeding can occur without warning symptoms, physicians should monitor for signs or symptoms of GI bleeding. Patients on long-term treatment with NSAIDs, should have a CBC and a chemistry profile checked periodically. If abnormal liver tests or renal tests persist or worsen, Voltaren Gel should be discontinued.
6 ADVERSE REACTIONS
6.1 Clinical Studies Experience
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the rates observed in practice.
During clinical development, 913 patients were exposed to Voltaren Gel in randomized, double-blind, multicenter, vehicle-controlled, parallel-group studies in osteoarthritis of the superficial joints of the extremities. Of these, 513 patients received Voltaren Gel for osteoarthritis of the knee and 400 were treated for osteoarthritis of the hand. Additionally, 583 patients were exposed to Voltaren Gel in an uncontrolled, open-label, long-term safety trial in osteoarthritis of the knee. Of these, 355 patients were treated for osteoarthritis of 1 knee and 228 were treated for osteoarthritis of both knees. Duration of exposure ranged from 8 to 12 weeks for the placebo-controlled studies, and up to 12 months for the open-label safety trial.
Short-Term Placebo-Controlled Trials:
Adverse reactions observed in at least 1% of patients treated with Voltaren Gel: Non-serious adverse reactions that were reported during the short-term placebo-controlled studies comparing Voltaren Gel and placebo (vehicle gel) over study periods of 8 to 12 weeks (16 g per day), were application site reactions. These were the only adverse reactions that occurred in >1% of treated patients with a greater frequency in the Voltaren Gel group (7%) than the placebo group (2%). Table 1 lists the types of application site reactions reported. Application site dermatitis was the most frequent type of application site reaction and was reported by 4% of patients treated with Voltaren Gel, compared to 1% of placebo patients.
Table 1. Non-serious Application Site Adverse Reactions (>1% Voltaren Gel Patients) — Short-term Controlled Trials
| Adverse Reaction†| Voltaren Gel N = 913 | Placebo (vehicle) N = 876 |
| N (%) | N (%) | |
| Any application site reaction | 62 (7) | 19 (2) |
| Application site dermatitis | 32 (4) | 6 (<1) td=""> |
| Application site pruritus | 7 (<1) td=""> | 1 (<1) td=""> |
| Application site erythema | 6 (<1) td=""> | 3 (<1) td=""> |
| Application site paresthesia | 5 (<1) td=""> | 3 (<1) td=""> |
| Application site dryness | 4 (<1) td=""> | 3 (<1) td=""> |
| Application site vesicles | 3 (<1) td=""> | 0 |
| Application site irritation | 2 (<1) td=""> | 0 |
| Application site papules | 1 (<1) td=""> | 0 |
†Preferred Term according to MedDRA 9.1. In the placebo-controlled trials, the discontinuation rate due to adverse reactions was 5% for patients treated with Voltaren Gel, and 3% for patients in the placebo group. Application site reactions, including application site dermatitis, were the most frequent reason for treatment discontinuation. Long-Term Open-Label Safety Trial:In the open-label, long-term safety study, distribution of adverse reactions was similar to that in the placebo-controlled studies. In this study, where patients were treated for up to 1 year with Voltaren Gel up to 32 g per day, application site dermatitis was observed in 11% of patients. Adverse reactions that led to the discontinuation of the study drug were experienced in 12% of patients. The most common adverse reaction that led to discontinuation of the study was application site dermatitis, which was experienced by 6% of patients.
7 DRUG INTERACTIONS
7.1 Aspirin
When diclofenac is administered with aspirin, the binding of diclofenac to protein is reduced, although the clearance of free diclofenac is not altered. The clinical significance of this interaction is not known; however, as with other NSAIDs, concomitant administration of diclofenac and aspirin is not generally recommended because of the potential of increased adverse effects.
7.2 Anticoagulants
The effects of anticoagulants such as warfarin and NSAIDs on GI bleeding are synergistic, such that users of both drugs together have a risk of serious GI bleeding higher than users of either drug alone.
7.3 ACE-Inhibitors
NSAIDs may diminish the antihypertensive effect of angiotensin converting enzyme (ACE) inhibitors. This interaction should be given consideration in patients taking NSAIDs concomitantly with ACE-inhibitors.
7.4 Diuretics
Clinical studies, as well as postmarketing observations, have shown that NSAIDs can reduce the natriuretic effect of furosemide and thiazides in some patients. The response has been attributed to inhibition of renal prostaglandin synthesis. During concomitant therapy with NSAIDs, the patient should be observed closely for signs of renal failure [see Warnings and Precautions (5.6)], as well as to assure diuretic efficacy.
7.5 Lithium
NSAIDs have produced an elevation of plasma lithium levels and a reduction in renal lithium clearance. The mean minimum lithium concentration increased 15% and the renal clearance was decreased by approximately 20%. These effects have been attributed to inhibition of renal prostaglandin synthesis by the NSAID. Thus, when NSAIDs, including diclofenac, and lithium are administered concurrently, patients should be observed carefully for signs of lithium toxicity.
7.6 Methotrexate
NSAIDs have been reported to competitively inhibit methotrexate accumulation in rabbit kidney slices. This may indicate that they could enhance the toxicity of methotrexate. Caution should be used when NSAIDs, including diclofenac, are administered concomitantly with methotrexate.
7.7 Cyclosporine
Diclofenac, like other NSAIDs, may affect renal prostaglandins and increase the toxicity of certain drugs. Therefore concomitant therapy with diclofenac may increase cyclosporine’s nephrotoxicity. Caution should be used when diclofenac is administered concomitantly with cyclosporine.
7.8 Oral Non-steroidal Anti-inflammatory Drugs
Specific interaction studies of Voltaren Gel and oral NSAIDs were not performed. Also, the clinical trials of Voltaren Gel prohibited concomitant use of oral NSAIDS. There is systemic exposure to diclofenac following normal use of Voltaren Gel, up to 6% of the systemic levels of a single oral dose of diclofenac sodium [see Clinical Pharmacology (12.3)]. Therefore, concomitant administration of Voltaren Gel with oral NSAIDs or aspirin may result in increased adverse NSAID effects.
7.9 Topical Treatments
Concomitant use of Voltaren Gel with other topical products, including topical medications, sunscreens, lotions, moisturizers, and cosmetics, on the same skin site has not been tested and should be avoided because of the potential to alter local tolerability and absorption.
8 USE IN SPECIFIC POPULATIONS
8.1 Pregnancy
The safety of Voltaren Gel has not been established during pregnancy. There are no well-controlled studies of diclofenac in pregnant women. Human and animal studies indicate that diclofenac crosses the placenta. In late pregnancy, as with other NSAIDs, Voltaren Gel should be avoided because it may cause premature closure of the ductus arteriosus. Teratogenic Effects Pregnancy Category C: Studies in mice, rats, and rabbits in which diclofenac was administered orally throughout gestation revealed no evidence of teratogenicity despite the induction of maternal toxicity and fetal toxicity corresponding to a human equivalent dose approximately 4.5-, 2-, and 9-fold (mouse, rat, rabbit, respectively) of the maximum human topical dose of Voltaren Gel (based on bioavailability and body surface area comparison). Nonteratogenic Effects The use of diclofenac, as with other NSAIDs, is associated with the adverse fetal cardiovascular effect of premature closure of the ductus arteriosus.
8.2 Labor and Delivery
In rat studies with oral NSAIDs, including diclofenac, as with other drugs known to inhibit prostaglandin synthesis, there is an increased incidence of dystocia and delayed parturition corresponding to a human equivalent dose approximately similar to the maximum recommended clinical dose (based on bioavailability and body surface area comparison). The effects of Voltaren Gel on labor and delivery in pregnant women are unknown.
8.3 Nursing Mothers
It is not known whether diclofenac is excreted in human milk; however, studies in animals detected diclofenac in the milk after oral administration. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from Voltaren Gel a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
8.4 Pediatric Use
Safety and effectiveness in pediatric patients have not been established.
8.5 Geriatric Use
Of the total number of subjects treated with Voltaren Gel in clinical studies, 498 were 65 years of age and over. No overall differences in effectiveness or safety were observed between these subjects and younger subjects, but greater sensitivity to the effect of NSAIDs in some older individuals cannot be ruled out. Diclofenac, as with any NSAID, is known to be substantially excreted by the kidney, and the risk of toxic reactions to Voltaren Gel may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken when using Voltaren Gel in the elderly, and it may be useful to monitor renal function.
10 OVERDOSAGE
There has been no experience of overdose with Voltaren Gel. No events of accidental ingestion have been reported with Voltaren Gel. Effects similar to those observed after an overdose of diclofenac tablets can be expected if substantial amounts of Voltaren Gel are ingested. Symptoms following acute oral NSAID overdoses are usually limited to lethargy, drowsiness, nausea, vomiting, and epigastric pain, which are generally reversible with supportive care. Gastrointestinal bleeding can occur. Hypertension, acute renal failure, respiratory depression, and coma may occur. Anaphylactoid reactions have been reported with therapeutic ingestion of NSAIDs, and may occur after an overdose. In the event of oral ingestion resulting in significant systemic side effects, it is recommended that the stomach be emptied by vomiting or lavage. Forced diuresis may theoretically be beneficial because the drug is excreted in the urine. The effect of dialysis or hemoperfusion in the elimination of diclofenac (99% protein-bound) remains unproven. In addition to supportive measures, the use of oral activated charcoal may help to reduce the absorption of diclofenac. Supportive and symptomatic treatment should be given for complications such as renal failure, convulsions, gastrointestinal irritation, and respiratory depression. For additional information about overdose treatment, call a poison control center (1-800-222-1222).
11 DESCRIPTION
Voltaren Gel (diclofenac sodium topical gel) is a non-steroidal anti-inflammatory drug (NSAID) for topical use only. It contains the active ingredient, diclofenac sodium, in an opaque, white gel base. Diclofenac sodium is a white to slightly yellow crystalline powder. Diclofenac sodium is a benzeneacetic acid derivative. The chemical name is 2-[(2,6-dichlorophenyl)amino]benzeneacetic acid, monosodium salt. The molecular weight is 318.14. Its molecular formula is C14H10Cl2NNaO2. It has the following structural formula: Voltaren Gel also contains carbomer homopolymer Type C, cocoyl caprylocaprate, fragrance, isopropyl alcohol, mineral oil, polyoxyl 20 cetostearyl ether, propylene glycol, purified water, and strong ammonia solution.
12 CLINICAL PHARMACOLOGY
12.1 Mechanism of Action
The mechanism of action of diclofenac is similar to that of other non-steroidal anti-inflammatory drugs. Diclofenac inhibits the enzyme, cyclooxygenase (COX), an early component of the arachidonic acid cascade, resulting in the reduced formation of prostaglandins, thromboxanes and prostacyclin. It is not completely understood how reduced synthesis of these compounds results in therapeutic efficacy.
12.2 Pharmacodynamics
Diclofenac, the active component of Voltaren Gel has anti-inflammatory, anti-nociception, and anti-pyretic effects.
12.3 Pharmacokinetics
The pharmacokinetics of Voltaren Gel were assessed in healthy volunteers following repeated applications during 7 days of Voltaren Gel to 1 knee (4 x 4 g per day) or to 2 knees and 2 hands (4 x 12 g per day) versus the recommended oral dose of diclofenac sodium for the treatment of osteoarthritis (3 x 50 mg per day). A summary of the pharmacokinetic parameters is presented in Table 2.
Table 2. Pharmacokinetic Parameters and Comparison of Voltaren Gel to Oral Diclofenac Sodium Tablets After Repeated Administration
| Treatment | Cmax(ng/mL) Mean    SD % of Oral (CI) | tmax(hr) Median (range) | AUC0-24(ng•h/mL) Mean    SD % of Oral (CI) |
| Voltaren Gel 4 x 4 g per day (=160 mg diclofenac sodium per day) | 15 ± 7.3 0.6% (0.5-0.7) | 14 (0-24) | 233 ± 128 5.8% (5-6.7) |
| Voltaren Gel 4 x 12 g per day (=480 mg diclofenac sodium per day) | 53.8 ± 32 2.2% (1.9-2.6) | 10 (0-24) | 807 ± 478 19.7% (17-22.8) |
| Diclofenac sodium tablets, orally 3 x 50 mg per day (=150 mg diclofenac sodium per day) | 2270 ± 778 100% | 6.5 (1-14) | 3890 ± 1710 100% |
Cmax = maximum plasma concentration; tmax = time of Cmax; AUC0-24 = area under the concentration-time curve; SD = standard deviation; CI = confidence interval.
Systemic exposure (area under the concentration-time curve) and maximum plasma concentrations of diclofenac are significantly lower with Voltaren Gel than with comparable oral treatment of diclofenac sodium.
Systemic exposure with recommended use of Voltaren Gel (4 x 4 g per day applied to 1 knee) is on average 17 times lower than with oral treatment. (Basis: treatment with Voltaren Gel of 1 knee, 4 times a day versus 50 mg, 3 times a day of oral diclofenac tablets.) The amount of diclofenac sodium that is systemically absorbed from Voltaren Gel is on average 6% of the systemic exposure from an oral form of diclofenac sodium.
The average peak plasma concentration with recommended use of Voltaren Gel (4 x 4 g per day applied to 1 knee) is 158 times lower than with the oral treatment.
The pharmacokinetics of Voltaren Gel has been tested under conditions of moderate heat (application of a heat patch for 15 minutes prior to gel application) and of moderate exercise (first gel application followed by a 20-minute treadmill exercise). No clinically relevant differences of systemic absorption and of tolerability were found between applications of Voltaren Gel (4 x 4 g per day on 1 knee) with and under the conditions tested. However, the pharmacokinetics of Voltaren Gel were not tested under the condition of heat application following gel application. Therefore, concurrent use of Voltaren Gel and heat is not recommended.
13 NONCLINICAL TOXICOLOGY
13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility
Carcinogenicity studies in mice and rats administered diclofenac sodium as a dietary constituent for 2 years at doses up to 2 mg/kg/day resulted in no significant increases in tumor incidence corresponding to a human equivalent dose approximately 0.5- and 1-fold (mouse and rat, respectively) of the maximum human topical dose of Voltaren Gel (based on bioavailability and body surface area comparison). In a dermal carcinogenicity study conducted in albino mice, daily topical applications of a diclofenac sodium gel product for two years at concentrations up to 0.035% diclofenac sodium (a 29-fold lower diclofenac sodium concentration than present in Voltaren Gel) did not increase neoplasm incidence. In a photococarcinogenicity study conducted in hairless mice, topical application of a diclofenac sodium gel product at doses up to 0.035% diclofenac sodium (a 29-fold lower diclofenac sodium concentration than present in Voltaren Gel) resulted in an earlier median time of onset of tumors. Diclofenac was not mutagenic or clastogenic in a battery of genotoxicity tests that included the bacterial reverse mutation assay, in vitro mouse lymphoma point mutation assay, chromosomal aberration studies in Chinese hamster ovarian cells in vitro, and in vivo rat chromosomal aberration assay of bone marrow cells. Diclofenac did not affect male or female fertility in rats at doses up to 4 mg/kg/day which induced toxicity, corresponding to a human equivalent dose approximately 2-fold greater than the maximum human topical dose of Voltaren Gel (based on bioavailability and body surface area comparison).
14 CLINICAL STUDIES
14.1 Pivotal Studies in Osteoarthritis of the Superficial Joints of the Extremities
Study 1 evaluated the efficacy of Voltaren Gel for the treatment of osteoarthritis of the knee in a 12-week, randomized, double-blind, multicenter, placebo-controlled, parallel-group trial. Voltaren Gel was administered at a dose of 4 g, 4 times daily, on 1 knee (16 g per day). Pain as assessed by the patients at Week 12 using the WOMAC (Western Ontario and McMaster Universities Osteoarthritis Index) Pain Subindex was lower in the Voltaren Gel group than the placebo group.
Study 2 evaluated the efficacy of Voltaren Gel for the treatment of osteoarthritis in subjects with osteoarthritis of the hand in an 8-week, randomized, double-blind, multicenter, placebo-controlled, parallel-group study. Voltaren Gel was administered at a dose of 2 g per hand, 4 times daily, on both hands (16 g per day). Pain in the target hand as assessed by the patients at Weeks 4 and 6 on a visual analog scale from 0 to 100 was lower in the Voltaren Gel group than the placebo group.
Table 3. Efficacy Outcomes of Voltaren Gel in Studies 1 and 2
| Voltaren Gel | Placebo (Vehicle) | Adjusted Difference (Placebo -Voltaren Gel) | ||
| Study 1 (Knee) WOMAC Pain*# at Week 12 | Sample Size | 127 | 119 | |
| Mean Outcome | 28 | 37 | Δ=7†| |
| 95% Confidence Interval | (1, 12) | |||
| Study 2 (Hand) Pain Intensity# at Week 4 | Sample Size | 198 | 187 | |
| Mean Outcome | 43 | 50 | Δ=7††| |
| 95% Confidence Interval | (2, 12) | |||
| Study 2 (Hand) Pain Intensity# at Week 6 | Sample Size | 198 | 187 | |
| Mean Outcome | 40 | 47 | Δ=7††| |
| 95% Confidence Interval | (1, 13) | |||
* WOMAC = Western Ontario McMaster Osteoarthritis Index. # Scale from 0 (best) to 100 (worst).
†Difference is adjusted using an analysis of covariance (ANCOVA) model with main effects of treatment and center and baseline covariate.
††Difference is adjusted using an analysis of covariance (ANCOVA) model with main effects of treatment, center, indicator for pain in the CMC-1 joint, and baseline as a covariate, and the treatment-by-CMC-1 indicator interaction. Difference is weighted by size of CMC-1 strata.
16 HOW SUPPLIED/STORAGE AND HANDLING
Voltaren Gel is available in tubes containing 100 g of the topical gel in each tube. Physician samples are packaged in 20 g tubes. Each tube contains diclofenac sodium in a gel base (10 mg of diclofenac sodium per gram of gel or 1%).
20 g tube (physician’s sample) . . . . . . . . . . . . . . . . . . .NDC 63481-684-83
100 g tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .NDC 63481-684-47
3 Pack (3 tubes containing 100 g each) . . . . . . . . . . . .NDC 63481-684-03
5 Pack (5 tubes containing 100 g each) . . . . . . . . . . . .NDC 63481-684-05
Storage
Store at 25°C (77°F); excursions permitted to 15-30°C (59-86°F). [See USP Controlled Room Temperature.]
Keep from freezing.
17 PATIENT COUNSELING INFORMATION See Medication Guide.
17.1 Medication Guide
Patients should be informed of the following information before initiating therapy with an NSAID and periodically during the course of ongoing therapy. Patients should be informed of the availability of a Medication Guide for Non-steroidal Anti-inflammatory Drugs (NSAIDs), and they should be instructed to read the Medication Guide prior to using Voltaren Gel.
17.2 Cardiovascular effects
Voltaren Gel, like other NSAIDs, may cause serious CV side effects, such as MI or stroke, which may result in hospitalization and even death. Although serious CV events can occur without warning symptoms, patients should be alert for the signs and symptoms of chest pain, shortness of breath, weakness, slurring of speech, and should ask for medical advice when observing any indicative sign or symptoms. Patients should be apprised of the importance of this follow-up [see Warnings and Precautions (5.1)].
17.3 Gastrointestinal effects
Voltaren Gel, like other NSAIDs, can cause GI discomfort and, rarely, more serious GI side effects, such as ulcers and bleeding, which may result in hospitalization and even death. Although serious GI tract ulcerations and bleeding can occur without warning symptoms, patients should be alert for the signs and symptoms of ulcerations and bleeding, and should ask for medical advice when observing any indicative sign or symptoms including epigastric pain, dyspepsia, melena, and hematemesis. Patients should be apprised of the importance of this follow-up [see Warnings and Precautions (5.2)].
17.4 Hepatotoxicity
Patients should be informed of the warning signs and symptoms of hepatotoxicity (e.g., nausea, fatigue, lethargy, diarrhea, pruritus, jaundice, right upper quadrant tenderness, and “flu-like†symptoms). If these occur, patients should be instructed to stop therapy with Voltaren Gel and seek immediate medical therapy [see Warnings and Precautions (5.3)].
17.5 Adverse Skin Reactions
Voltaren Gel, like other NSAIDs, can cause serious skin side effects such as exfoliative dermatitis, SJS, and TEN, which may result in hospitalizations and even death. Although serious skin reactions may occur without warning, patients should be alert for the signs and symptoms of skin rash and blisters, fever, or other signs of hypersensitivity such as itching, and should ask for medical advice when observing any indicative signs or symptoms [see Warnings and Precautions (5.8)].
Patients should be advised to stop Voltaren Gel immediately if they develop any type of rash and contact their physicians as soon as possible. Patients should be instructed not to apply Voltaren Gel to open skin wounds, infections, inflammations, or exfoliative dermatitis, as it may affect absorption and tolerability of the drug. Patients should be instructed to avoid concomitant use of Voltaren Gel with other topical products, including sunscreens, cosmetics lotions, moisturizers, insect repellants, on the treated skin site. Concomitant use may result in skin reactions or change the absorption of Voltaren Gel. Patients should be instructed to minimize or avoid exposure of treated areas to natural or artificial sunlight.
17.6 Weight Gain and Edema
Patients should promptly report to their physicians signs or symptoms of unexplained weight gain or edema following treatment with Voltaren Gel [see Warnings and Precautions (5.5)].
17.7 Anaphylactoid Reactions
Patients should be informed of the signs of an anaphylactoid reaction (e.g., difficulty breathing, swelling of the face or throat). If these occur, patients should be instructed to seek immediate emergency help [see Warnings and Precautions (5.7)].
17.8 Effects During Pregnancy
In late pregnancy, as with other NSAIDs, Voltaren Gel should be avoided because it will cause premature closure of the ductus arteriosus [see Warnings and Precautions (5.9)].
17.9 Eye Exposure
Patients should be instructed to avoid contact of Voltaren Gel with the eyes and mucosa, although not studied, should be avoided. Patients should be advised that if eye contact occurs, they should immediately wash out the eye with water or saline and consult a physician if irritation persists for more than an hour.
Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. The material appearing on this page is for informational use only. It should not be used as a substitute for professional medical advice, diagnosis or treatment.
