by 
Anonymous
ANSWERS: 7
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not everything is 100% effective
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Some antibiotics can affect the absorbtion of hormones in the pill, reducing it's effectiveness. Also one of the side effects to antibiotics can be vomiting, if you vomit within a couple of hours of taking your pill then it can obviously make it less effective. As a rule of thumb, if you take a course of antibiotics whilst on the pill I would also take secondary precautions to ensure you are safe. Hope this helps.
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Antibiotics. (That's what I was told when I was on. But it looks like one particular one now.) http://www.mayoclinic.com/health/birth-control-pill/WO00098 Can antibiotics decrease the effectiveness of birth control pills? The effects of antibiotics on birth control pills may be overstated — except in the case of one antibiotic, rifampin. Studies clearly show that rifampin decreases the effectiveness of birth control pills in preventing ovulation. Hypothetically speaking, other antibiotics, particularly penicillin and tetracycline derivatives, could impair the effectiveness of birth control pills. However, no large studies have proved such an effect. Researchers can't rule out the possibility that a small percentage of women may experience decreased effectiveness of birth control pills while taking an antibiotic. And if you're taking a newer, extremely low-dose oral contraceptive, you could be more susceptible to these potential effects from antibiotics. If you're concerned, consider using a barrier method of contraception for the duration of your antibiotic prescription.
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There are somethings that can make a birth control pill to be ineffective: antibiotics can do this as well as some anti depressents, anti seizure medication and anti fungal medications. Even herbal pills, such as St.Johns Wort, can make the pill ineffective. Make sure you tell your your doctor the medications you are on if they are going to prescribe you anything.
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st. john's wart (vitamins) can also make a woman miscarry if she's pregnant
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I'm thinking the biggest thing would be failure to take them.
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Does ephedra diet pills make BC less effective?
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