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Selective COX-2 inhibitor class of drugs may be associated with an increased risk of thrombotic events (especially MI and stroke), relative to placebo and some NSAIDs (Naproxen). As the cardiovascular risks of selective COX-2 inhibitors may increase with dose and duration of exposure, the shortest duration possible and the lowest effective daily dose should be used. The patient's need for symptomatic relief and response to therapy should be re-evaluated periodically.
Patients with significant risk factors for cardiovascular events (e.g. hypertension, hyperlipidemia, diabetes mellitus, smoking) should only be treated with Etoricoxib after careful consideration.
Selective COX-2 inhibitors are not a substitute for Aspirin for cardiovascular prophylaxis because of their lack of effect on platelets. Because Etoricoxib, a member of this class, does not inhibit platelet aggregation, antiplatelet therapies should not be discontinued.
There is a further increase in the risk of gastrointestinal adverse effects (gastrointestinal ulceration or other gastrointestinal complications) for Etoricoxib, other selective COX-2 inhibitors and NSAIDs, when taken concomitantly with Acetylsalicylic acid (even at low doses). The relative difference in gastrointestinal safety between selective COX-2 inhibitors + Acetylsalicylic acid vs. NSAIDs + Acetylsalicylic acid has not been adequately evaluated.
In patients with advanced renal disease, treatment with Etoricoxib is not recommended. Clinical experience in patients with estimated creatinine clearance of < 30 mL/min is very limited. If therapy with Etoricoxib must be initiated in such patients, close monitoring of the patient's renal function is advisable.
Long-term administration of NSAIDs has resulted in renal papillary necrosis and other renal injury. Renal prostaglandins may play a compensatory role in the maintenance of renal perfusion. Therefore, under conditions of compromised renal perfusion, administration of Etoricoxib may cause a reduction in prostaglandin formation and, secondarily, in renal blood flow, and thereby impair renal function. Patients at greatest risk of this response are those with pre-existing significantly impaired renal function, uncompensated heart failure, or cirrhosis. Monitoring of renal function in such patients should be considered.
Caution should be used when initiating treatment with Etoricoxib in patients with considerable dehydration. It is advisable to rehydrate patients prior to starting therapy with Etoricoxib.
As with other drugs known to inhibit prostaglandin synthesis, fluid retention, edema and hypertension have been observed in some patients taking Etoricoxib. The possibility of fluid retention, edema or hypertension should be taken into consideration when Etoricoxib is used in patients with pre-existing edema, hypertension, or heart failure. All Non-steroidal Anti-inflammatory Drugs (NSAIDs), including Etoricoxib, can be associated with new onset or recurrent congestive heart failure. (See Adverse Reactions). Etoricoxib may be associated with more frequent and severe hypertension than some other NSAIDs and selective COX-2 inhibitors, particularly at high doses. Therefore, special attention should be paid to blood pressure monitoring during treatment with Etoricoxib. If blood pressure rises significantly, alternative treatment should be considered.
Physicians should be aware that individual patients may develop upper gastrointestinal (GI) ulcers/ulcer complications irrespective of treatment. Although the risk of GI toxicity is not eliminated with Etoricoxib, the risk of GI toxicity with Etoricoxib 60 mg or 90 mg once daily is significantly less than with Diclofenac 150 mg daily. These events can occur at any time during use and without warning symptoms. Independent of treatment, patients with a prior history of GI perforation, ulcers and bleeding (PUB) and patients greater than 65 years of age are known to be at a higher risk for a PUB.
A patient with symptoms and/or signs suggesting liver dysfunction, or in whom an abnormal liver function test has occurred, should be evaluated for persistently abnormal liver function tests. If persistently abnormal liver function tests (three times the upper limit of normal) are detected, Etoricoxib should be discontinued.
Etoricoxib should be used with caution in patients who have previously experienced acute asthmatic attacks, urticaria, or rhinitis, which were precipitated by salicylates or non-selective cyclo-oxygenase inhibitors. Since the pathophysiology of these reactions is unknown, physicians should weigh the potential benefits of prescribing Etoricoxib versus the potential risks.
When using Etoricoxib in the elderly and in patients with renal, hepatic, or cardiac dysfunction, medically appropriate supervision should be maintained. If these patients deteriorate during treatment, appropriate measures should be taken, including discontinuation of therapy.
Serious skin reactions, some of them fatal, includes exfoliative dermatitis, Stevens-Johnson syndrome, and toxic epidermal necrolysis in association with the use of NSAIDs and some selective COX-2 inhibitors. These serious events may occur without warning. Patients appear to be at highest risk for these reactions early in the course of therapy: the onset of the reaction occurring in the majority of cases within the first month of treatment. Serious hypersensitivity reactions (such as anaphylaxis and angioedema) have been reported in patients receiving Etoricoxib (see Adverse Reactions).
Some selective COX-2 inhibitors have been associated with an increased risk of skin reactions in patients with a history of any drug allergy. Etoricoxib should be discontinued at the first appearance of skin rash, mucosal lesions, or any other sign of hypersensitivity.
Etoricoxib may mask fever, which is a sign of infection. The physician should be aware of this when using Etoricoxib in patients being treated for infection.
Effects on Ability to Drive and Use Machines: Patients who experience dizziness, vertigo or somnolence while taking Etoricoxib should refrain from driving or operation machinery.
