Think because you're taking precautions you won't get pregnant? Think again. Better read this if you're on the Pill -- or using a diaphragm.
By Samantha Leal for TheNest.com

Antibiotics
If you're sick and your doc prescribes antibiotics, make sure to check the package insert and ask your doctor or pharmacist for information before getting hot 'n' heavy. In many cases, antibiotics can reduce the effectiveness of birth control pills by reducing the amount of certain hormones (found in birth control pills) in the bloodstream. If the level of hormones gets too low, the drug won't work to prevent pregnancy. Rifampin, one type of antibiotic, is especially likely to reduce the Pill's effectiveness. (So grab that box of condoms on your way out of the pharmacy.)
St. John's Wort
Think "herbal" means "can't do anything wrong to your body"? Think again. St. John's wort is a top-selling botanical product that's been used for centuries in medicine. And since
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