Piroxicam Drug Profile

What is Piroxicam?

Piroxicam is a nonsteroidal anti-inflammatory drug (NSAID) that belongs to the oxicam class of medications. It is primarily used to reduce inflammation, pain, and fever in various conditions affecting the joints and soft tissues. This prescription medication is particularly valued for its long duration of action, allowing for once-daily dosing in many patients.

Uses

Piroxicam is approved and commonly prescribed for several inflammatory conditions:

• Rheumatoid arthritis: Helps reduce joint inflammation, pain, and stiffness associated with this autoimmune condition
• Osteoarthritis: Provides pain relief and reduces inflammation in degenerative joint disease
• Ankylosing spondylitis: Manages inflammation and pain in this chronic inflammatory condition affecting the spine
• Acute musculoskeletal disorders: Treats short-term inflammatory conditions such as bursitis, tendinitis, and acute gout attacks
• Primary dysmenorrhea: Reduces menstrual pain and cramping by decreasing uterine inflammation

How it works

Piroxicam works by inhibiting cyclooxygenase (COX) enzymes, specifically COX-1 and COX-2, which are responsible for producing prostaglandins. Prostaglandins are chemical messengers that promote inflammation, pain, and fever. By blocking these enzymes, piroxicam reduces the production of prostaglandins, thereby decreasing inflammation, alleviating pain, and lowering fever when present.

Side effects

Common side effects include:

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• Stomach upset, nausea, or indigestion
• Diarrhea or constipation
• Dizziness or headache
• Drowsiness or fatigue
• Fluid retention and swelling
• Rash or skin irritation
• Ringing in the ears (tinnitus)
• Elevated blood pressure

Serious side effects requiring immediate medical attention:

• Gastrointestinal bleeding or ulceration (black, tarry stools or vomiting blood)
• Severe allergic reactions including difficulty breathing or swelling of face and throat
• Signs of liver damage such as yellowing of skin or eyes, dark urine
• Kidney problems including decreased urination or swelling
• Cardiovascular events such as chest pain, shortness of breath, or weakness on one side of the body

Warnings and precautions

• Cardiovascular risk: Piroxicam may increase the risk of serious cardiovascular events, including heart attack and stroke, particularly with long-term use or in patients with existing heart disease
• Gastrointestinal complications: Can cause serious stomach and intestinal bleeding, ulceration, and perforation, which may occur without warning symptoms
• Kidney and liver function: Should be used with caution in patients with impaired kidney or liver function, as piroxicam can worsen these conditions
• Pregnancy considerations: Should be avoided during pregnancy, especially in the third trimester, as it may cause harm to the developing fetus and complications during labor
• Elderly patients: Older adults are at higher risk for serious side effects and should use the lowest effective dose for the shortest duration possible

Interactions

Piroxicam can interact with several medications and substances:

• Warfarin and other blood thinners: Increases bleeding risk due to enhanced anticoagulant effects
• ACE inhibitors and ARBs: May reduce the effectiveness of these blood pressure medications and increase kidney damage risk
• Lithium: Piroxicam can increase lithium levels in the blood, potentially causing toxicity
• Methotrexate: May increase methotrexate toxicity by reducing its elimination from the body
• Diuretics: Can reduce the effectiveness of water pills and increase risk of kidney problems
• Other NSAIDs and aspirin: Increases risk of gastrointestinal bleeding and reduces piroxicam’s effectiveness
• Corticosteroids: Combined use significantly increases the risk of gastrointestinal ulceration and bleeding
• Alcohol: Increases risk of stomach bleeding and liver damage

Check interactions with the GMJ Interaction Checker

Dosage

Typical adult dosages vary depending on the condition being treated. For rheumatoid arthritis and osteoarthritis, the usual dose is 20 mg once daily or 10 mg twice daily. For acute conditions, the dose may be 40 mg initially, followed by 20 mg daily. The maximum recommended daily dose is typically 40 mg. Due to piroxicam’s long half-life, once-daily dosing is often sufficient. Healthcare providers will determine the appropriate dose based on the patient’s condition, response to treatment, and risk factors. It is important to use the lowest effective dose for the shortest duration necessary to minimize side effects.

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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