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A large number of antibiotics can lessen the effects of the pill, however there is no concrete evidence that they effect everyone in this way and it is important to remember that every body is different. But on the whole, antibiotics such as penicillin, amoxycillin, metronidazole, ofloxacin, etc have been found to decrease the effectiveness of Birth Control. Some antibiotics, like fluconazole and trimethoprim have no effect on it.

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Q: Does metronidazole affect birth control
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