Drug interaction: "Antibiotics such as sulfamethoxazole may reduce the effects of ethinyl estradiol in some women. If you are using ethinyl estradiol for birth control, you may be at increased risk for pregnancy or breakthrough bleeding." (http://www.drugs.com/interactions-check.php?drug_list=1042-6788,2128-3104)
Answered 5/14/2015
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