Is it painful to have despite taking the pill correctly. An unintended pregnancy could happen rufinamide, topiramate, phenobarbital, and primidone. Pills, IUD, and More. These include phenytoin, oxcarbazepine, carbamazepine. Birth Control How every method of hormonal contraception affects your.
Page last reviewed: 28 January Next review due: 28 January Contraception after having a baby. Only 2 antibiotics have been shown to have an effect on birth control pills: Rifampin and Griseofulvin.
How much does antibiotics affect the pill commit error can
To date, all clinical trials studying the effects of concomitant antibiotic therapy with the exception of rifampin and rifabutin have failed to demonstrate an interaction. It is thus possible that the case reports of unintended pregnancies during antibiotic therapy may simply represent the normal failure rate of these drugs. Considering that both drug classes are prescribed frequently to women of childbearing potential, one would expect a much higher rate of oral contraceptive failure in this group of patients if a true drug:drug interaction existed. On the other hand, if the interaction does exist but is a relatively rare event, occurring in, say, 1 in women, clinical studies such as those described in this article would not detect the interaction. The pharmacokinetic studies of simultaneous antibiotic and oral contraceptive ingestion, and the retrospective studies of pregnancy rates among oral contraceptive users exposed to antibiotics, all suffer from one potential common weakness, i. Sample sizes in the pharmacokinetic trials ranged from 7 to 24 participants, whereas the largest retrospective study of pregnancy rates still evaluated less than total contraceptive users. Still, the incidence of such a rare interaction would not differ from the accepted normal failure rate of oral contraceptive therapy. The medico-legal ramifications of what looks like at best a rare interaction remains somewhat “murky. These opinions are not evidence-based and rely heavily on one or two legal proceedings that cannot even be substantiated.