Etoricoxib Drug Profile

What is Etoricoxib?

Etoricoxib is a prescription nonsteroidal anti-inflammatory drug (NSAID) that belongs to a specific subclass called COX-2 selective inhibitors. It is primarily used to treat pain and inflammation associated with arthritis and other musculoskeletal conditions. This medication provides anti-inflammatory, analgesic, and antipyretic effects while potentially causing fewer gastrointestinal side effects compared to traditional NSAIDs.

Uses

Etoricoxib is approved for several inflammatory and pain conditions:

• Osteoarthritis: Reduces joint pain and stiffness in degenerative joint disease
• Rheumatoid arthritis: Manages inflammation and pain in autoimmune joint conditions
• Ankylosing spondylitis: Treats inflammation of the spine and sacroiliac joints
• Acute gouty arthritis: Provides rapid relief from gout flare-ups and associated inflammation
• Acute pain conditions: Short-term management of moderate to severe pain, including dental pain and post-operative pain

How it works

Etoricoxib works by selectively inhibiting cyclooxygenase-2 (COX-2), an enzyme responsible for producing inflammatory substances called prostaglandins. Unlike traditional NSAIDs that block both COX-1 and COX-2 enzymes, etoricoxib primarily targets COX-2, which is associated with inflammation and pain. This selective action theoretically reduces the risk of gastrointestinal ulcers and bleeding that can occur with COX-1 inhibition, though cardiovascular risks may still be present.

Side effects

Common side effects include:

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• Headache
• Dizziness
• Nausea and stomach discomfort
• Diarrhea or constipation
• Swelling in legs, ankles, or feet (edema)
• Fatigue
• Upper respiratory tract infections
• High blood pressure

Serious side effects requiring immediate medical attention:

• Heart attack or stroke symptoms (chest pain, shortness of breath, sudden weakness)
• Severe allergic reactions (difficulty breathing, swelling of face or throat)
• Signs of liver problems (yellowing of skin or eyes, dark urine, severe abdominal pain)
• Kidney problems (decreased urination, swelling, unusual fatigue)
• Severe skin reactions (blistering, peeling, widespread rash)

Warnings and precautions

• Cardiovascular risk: Etoricoxib may increase the risk of heart attack and stroke, especially with long-term use or in patients with existing heart disease
• Pregnancy and breastfeeding: Should be avoided during pregnancy, particularly in the third trimester, as it may harm the developing fetus and interfere with labor
• Kidney and liver function: Regular monitoring is required in patients with impaired kidney or liver function, as the drug can worsen these conditions
• Blood pressure: Can elevate blood pressure and should be used cautiously in patients with hypertension
• Elderly patients: Increased risk of serious side effects, particularly cardiovascular and gastrointestinal complications

Interactions

• Warfarin and anticoagulants: Increased risk of bleeding due to enhanced anticoagulant effects
• ACE inhibitors and diuretics: Reduced effectiveness of blood pressure medications and potential kidney problems
• Lithium: Etoricoxib can increase lithium levels, leading to toxicity
• Methotrexate: Increased methotrexate toxicity due to reduced elimination
• Aspirin: May reduce cardioprotective effects of low-dose aspirin
• Cyclosporine: Increased risk of kidney toxicity when used together
• Rifampin: May reduce etoricoxib effectiveness by increasing its metabolism
• St. John’s Wort: May decrease etoricoxib levels and reduce its effectiveness

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Dosage

Typical adult dosages vary by condition being treated. For osteoarthritis, the usual dose is 30-60 mg once daily. Rheumatoid arthritis and ankylosing spondylitis typically require 60-90 mg once daily. Acute gout may be treated with 120 mg once daily for up to 8 days. For acute pain conditions, 60-90 mg once daily is commonly prescribed for short-term use. The lowest effective dose should be used for the shortest duration necessary. Dosage adjustments may be required in elderly patients or those with kidney or liver impairment. Always follow your healthcare provider’s specific dosing instructions, as individual needs may vary based on medical history and response to treatment.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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