Does bactrim affect menstrual cycle

Answer 1

If you are taking a combined oral contraceptive pill or are using contraceptive patches, there may be a very low risk that this antibiotic may make it less effective at preventing pregnancy. Although the risk of this is very low, the personal and ethical consequences of an unwanted pregnancy can be very serious. For this reason, the Family Planning Association recommends that women using a combined contraceptive pill or patch should use an extra method of contraception (eg condoms) while taking a short course of broad-spectrum antibiotic, and for seven days after finishing the course. If the seven days run beyond the end of a pill packet, a new packet should be started without a break (in the case of ED pills the inactive tablets should be omitted). If the seven days run beyond the 3 weeks of patch treatment, a new treatment cycle should be started immediately without a patch-free break.
Trimethoprim is an antibiotic that is usually given in combination with another antibiotics called sulfamethoxazole (sold as Bactrim, Septra and others). All antibiotics can, at least in theory, reduce the effectiveness of oral contraceptives ("Birth Control") and so it is commonly recommended to use another form of contraception while taking them.
If you are taking a combined oral contraceptive pill or are using contraceptive patches, there may be a very low risk that this antibiotic may make it less effective at preventing pregnancy. Although the risk of this is very low, the personal and ethical consequences of an unwanted pregnancy can be very serious. For this reason, the Family Planning Association recommends that women using a combined contraceptive pill or patch should use an extra method of contraception (eg condoms) while taking a short course of broad-spectrum antibiotic, and for seven days after finishing the course. If the seven days run beyond the end of a pill packet, a new packet should be started without a break (in the case of ED pills the inactive tablets should be omitted). If the seven days run beyond the 3 weeks of patch treatment, a new treatment cycle should be started immediately without a patch-free break.
There is no drug interaction listed between trimethoprim and triphasil. But if you are taking triphasil and get pregnant this is dangerous. Do not use Triphasil if you are pregnant or if you recently had a baby. Do not use Triphasil if you have a history of stroke or blood clot, circulation problems (especially if caused by Diabetes), a hormone-related cancer such as breast or uterine cancer, abnormal vaginal bleeding, liver disease or liver cancer, severe high blood pressure, migraine headaches, or a heart valve disorder.

Answer 2

You will need to speak to your Doctor about this or your Pharmacist.

Answer 3

Yes.. depends on certain antibiotics, and tbe timing of unprotected sex.