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Does taking azithromycin for a chlamydia infection affect the effectiveness of the contraceptive pill?

Taking azithromycin for a chlamydia infection does not affect the effectiveness of your contraceptive pill. However, if you experience diarrhea during your treatment, it may potentially reduce the absorption of your pill. This is true for all types of diarrhea, whether it is caused by antibiotics or something else (e.g. stomach flu).