Lowered Birth Control Effectiveness?

I heard and read on my birth control directions that some drugs can lower the value of birth control, so my questions (yes, plural) are these: What are these drugs, why do they lower the efficiency and how, and how can I avoid these drugs if they are necessary? I be a sign of, say that one of the headache pills I give somebody a lift have be known to lower the birth control usefulness, but I have to pilfer them because I'm allergic to everything else, can you point me to something else?

Thanks, everyone who is brave enough to meet this question.

~~Nao
Answers:

White discharge?

There are several antibiotics (rifampin is one) that are used for TB that can trade name the pills less decisive. Some people consider that penicillin ampicillin and tetracycline can also make the pill for a moment less significant. Anti seizure drugs can also formulate the pills less influential. One reason is that these drugs speed up the enzymes surrounded by your liver that break the pill down. They work too fast so you find 20 hours instead of 24 hours out of each dose. If you are merely on antibiotics for a short time preserve taking the pills and use condoms for the rest of the cycle. If you must be on a medication everyday then one strategy is to use a stronger or complex dose pill or to select something like depo provera which is not artificial by these medications. Hope this help.

Little white bumps?

Usually the meds that lower the effect of BC pills are antibioticsIf you are on any antibiotics i would strongly reccomend to use a second method of birth control such as condoms etc. But if you are troubled over lets speak Tylonol or advil or some sort of head soreness or pain med, dont be you should be ok. If you are taking other meds and are not pretty sure call your pharmacy and ask if what you are taking interacts next to you BC pills. That would be a good impression.