According to the CDC, Oral Contraceptives have a failure rate of 9%. Thus meaning their effectiveness is only 91%
When taken in the proper amounts, following a specific schedule, oral contraceptives are very effective in preventing pregnancy
Oral contraceptives (or "the pill") Sterilization
Oral contraceptives do not protect against AIDS
Carbamazepine causes the oral contraceptive to be broken down in the body more quickly, making it less effective at preventing pregnancy.
Not all pills are contraceptives. For example, aspirin, simvastatin, and sildenafil do not prevent pregnancy.
Oral contraceptives are available only with a physician's prescription
Condoms are the only contraceptives that prevent both pregnancy and the spread of STD's, so they are hands-down the best method of contraception (with a success rate upwards of 98% when used correctly). To absolutely prevent pregnancy, it would be wise to use condoms AND a daily oral contraceptive (in case of condom failure, daily oral contraceptives are up to 99% effective when used correctly).
Oral contraceptives may make some existing cancers worse
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Blood sugar levels may increase slightly when oral contraceptives are used
Oral contraceptives may cause the gums to become tender and swollen or to bleed
Women who are breastfeeding should check with their physicians before using oral contraceptives