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Oxacillin may decrease the efficacy of estrogen-containing contraceptives. Tetracycline, a bacteriostatic antibitotic, may antagonize the bactericidal effect of penicillin and concurrent use of these drugs should be avoided.
Probenicid increase half-life of penicillins. Synegristic effects with aminoglycosides. Erythema multiforme with amoxicillin after MMR vaccination.
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