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| *Women health>>>Birth Control Pills |
What is the percentage of birth-control pill effectiveness when taken with carbamazepine (Tegretol XR)? |
What is the percentage of birth-control pill effectiveness when taken with carbamazepine (Tegretol XR)? Carbamazepine will increase the rate which your liver metabolizes your birth control pills. It\s not possible to know exactly what percentage it lowers it by, in your specific case or in any specific case. Carbamazepine slowly induces the enzymes in your liver (that metabolize it, and other things) so it's partially dependent on how long you've been on it (the effect takes a few days to get going). Most likely you've been on it awhile though. The degree of your own body's reaction to the induction of these enzymes cannot be known without actually running tests. Medicine is not an exact science. Below is from drugdigest.org: CONTRACEPTIVES, ORAL (in Ethinyl Estradiol and Levonorgestrel, Ethinyl Estradiol and Norgestimate, Ethinyl Estradiol and Norgestrel) may interact with CARBAMAZEPINE (in Tegretol) Carbamazepine may increase the rate at which oral contraceptives are removed from the body. This may result in contraceptive failure and an unintended pregnancy. If you are taking carbamazepine, your doctor may choose to use an oral contraceptive product that contains a high dose of estrogen and progestin. Consider using other methods of contraception, if necessary. You may want to ask your healthcare provider about this potential interaction if you think you are having problems. This interaction is poorly documented and is considered moderate in severity. |
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