Meloxicam Side Effects
Meloxicam causes gastrointestinal side effects (dyspepsia, abdominal pain, nausea, diarrhea) in approximately 13-28% of patients, with serious GI complications (perforation, ulceration, bleeding) occurring in 0.1-0.8% of cases, and can also cause hypersensitivity reactions including severe cutaneous adverse reactions like Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN), particularly as an oxicam-class NSAID. 1, 2, 3, 4
Gastrointestinal Side Effects
The most common adverse effects are GI-related:
- Common GI symptoms include dyspepsia, abdominal pain, nausea/vomiting, and diarrhea, affecting 13-28% of patients 3, 5, 4
- Serious GI complications (perforation, ulceration, bleeding) occur in 0.1-0.8% of patients taking meloxicam 7.5-15 mg 3, 4
- Meloxicam demonstrates significantly better GI tolerability compared to other NSAIDs like diclofenac (13% vs 19% GI adverse events) and naproxen, likely due to its preferential COX-2 selectivity 3, 5
Clinical caveat: High-dose meloxicam (20 mg/kg in animal studies) caused gastritis and fecal occult blood when given for 3-7 days, though effects resolved by day 15 6. This suggests dose-dependent GI toxicity.
Hypersensitivity and Severe Cutaneous Reactions
As an oxicam derivative, meloxicam carries specific allergy risks:
- Oxicam NSAIDs (including meloxicam) are among the most commonly associated with SJS/TEN 1
- Oxicams are highly associated with other severe cutaneous adverse drug reactions (SCARs) including DRESS and AGEP 1
- Oxicams are common causes of fixed drug eruption (FDE) 1
- Cross-reactivity within the oxicam class is well-described, and for severe reactions, avoidance of the entire class is recommended without rechallenge 1
Important pitfall: NSAIDs may be falsely implicated in SJS/TEN cases when they are started for prodromal fever symptoms (protopathic effect) 1.
Other Organ System Toxicity
- Renal toxicity: NSAIDs including meloxicam are among the most common causes of drug-induced interstitial nephritis 1. Animal studies showed glomerular hypertrophy and focal interstitial nephritis 7
- Hepatotoxicity: Mononuclear cell infiltration and pseudolobular formation observed in animal studies 7
- Hematologic: Anemia and edema reported 2
- Rare reactions: Drug-induced pneumonitis and aseptic meningitis (though meningitis is more common with ibuprofen) 1
Delayed Hypersensitivity Reactions
Delayed drug hypersensitivity reactions comprise <5% of NSAID reactions and occur >6 hours after dosing (often days to weeks):
- Maculopapular exanthem
- Urticarial drug eruption
- Phototoxic and photoallergic rashes
- Contact dermatitis 1
Discontinuation Rates
- 13.7% of patients discontinued meloxicam due to adverse events in long-term studies 4
- Only 3.9% discontinued specifically due to GI adverse events 4
- 5.48% discontinued in comparative trials versus 7.96% with diclofenac 5
Key clinical consideration: While meloxicam has improved GI safety compared to non-selective NSAIDs, it still carries the class-wide risks of serious GI complications, renal toxicity, and as an oxicam, has heightened risk for severe cutaneous reactions including SJS/TEN. Patients with prior severe cutaneous reactions to any oxicam should avoid the entire class 1.