| Carbenicillin, piperacillin, ticarcillin | |
| Isoniazid, Rifampin, Pyrazinamide, Ethambutol | |
| Sulfamethoxazole: interferes with bacterial folic acid synthesis from para-aminobenzoic acid trimethoprim: inhibits dihydrofolic acid reduction to tetrahydrofolate | |
| Cimetidine, ciprofloxacin, clarithromycin, erythromycin, fluvoxamine, gemfibrozil, isoniazid, ketoconazole, zileuton |