What kinds of medicines decrease birth control pills effectiveness?

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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 medication, tell your doctor or pharmacist of all prescription and non-prescription/herbal medications you may use, especially of: thyroid hormone drugs, 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. This product can affect the results of certain lab tests (e.g., thyroid). Inform all laboratory personnel that 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.

http://www.medicinenet.com/oral_contraceptives/page3.htm
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How effective is the birth control pill and spermicide?

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Does soda pop reduce the effectiveness of birth control pills?

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What are the side effects of the birth control pill?

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What birth control pill helps decrease my appetite and control acne?

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How effective is the birth control pill?

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Is the birth control pill effective?

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What all medicines will make my birth control less effective?

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How effective is the withdrawal method after stopping birth control pills?

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Does cold medicine affect the birth control pill?

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How effective is the birth control pill for teens?

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Does ginseng affect birth control pill effects?

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Does pain medicine affect your birth control effectiveness?

The category of pain medications is so broad that no generalization can be made. Most medications used for pain don't affect how well birth control works. A few medications used as adjunct pain treatment do. You must contact your prescriber or pharmacist for advice specific to your situation.

How long is the birth control pill effective?

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