DRUG INTERACTIONS: Certain drugs can decrease the effectiveness of combination-type birth control pills by decreasing the amount of birth control pill hormones in your system (impaired enterohepatic recirculation or hepatic induction). This can result in pregnancy. Consult your doctor or pharmacist for details. Drugs that may cause this effect include: many antibiotics (e.g., cephalosporins, chloramphenicol, macrolides, penicillins, tetracyclines, sulfas), aprepitant, bexarotene, bosentan, dapsone, griseofulvin, certain HIV protease inhibitors (e.g., amprenavir, nelfinavir, ritonavir), modafinil, nevirapine, rifamycins (e.g., rifampin), many seizure medications (e.g., barbiturates, carbamazepine, phenytoin, primidone, topiramate), St. John's wort. Ask your doctor if you should use additional reliable birth control methods while taking any of the drugs mentioned above while also taking birth control pills. Before using this medications, tell your doctor or pharmacist of all prescription and non-prescription/herbal medications you may use, especially of: thyroid hormone drugs, theophylline, certain benzodiazepines (e.g., diazepam, chlordiazepoxide), prednisone-like drugs, certain antidepressants (e.g., tricyclics), beta-blockers (e.g., metoprolol), "blood thinners" (anticoagulants such as warfarin), insulin, magnesium trisilicate, levodopa, penicillamine. This product can affect the results of certain lab tests. Make sure laboratory personnel and your doctors know you use this drug. Birth control pills may significantly intensify the effects of alcohol. Consult your doctor or pharmacist about this. Do not start or stop any medicine without doctor or pharmacist approval.

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