Interactions
Drug-Drug
- May ↑ half-life, ↓ clearance, and exaggerate folic acid deficiency caused by phenytoin.
- May ↑ effects of sulfonylurea oral antidiabetics, phenytoin, digoxin, thiopental and warfarin.
- May ↑ toxicity of methotrexate.
- ↑ risk of thrombocytopenia from thiazide diuretics (↑ in geriatric patients).
- ↓ efficacy of cyclosporine (decreases serum concentrations) and ↑ risk of nephrotoxicity.
trimethoprim/sulfamethoxazole has been found in Davis's Drug Guide
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