A general rule of thumb is that any birth control medication is fully effective after one complete cycle of the medication; which is usually one complete menstrual cycle. Medication effects everyone differently so you may or may not suffer any side effect. Talk with the doctor about side effects and which ones would require a change in medication if you should suffer any of them.
While birth control pills when taken properly are 99% effective in preventing pregnancy they are not effective in preventing STDS. Until you are married or in a long term relationship and both have been tested. You partner should always use a condom. Condoms are not 100% effective in protecting against all STDS but they protect against many. Your best protection against STDS is knowing who you are having sex with and staying away from the players who insist on not using condoms and live for one night stands. [ adviceman49's advice column | Ask adviceman49 A Question ]
Rena-Chan answered Wednesday August 22 2012, 9:00 am: In order for your BCP's to be effective, you must take them everyday, for at least 7 days. As for side effects, everyone is different. Some people get some if not all the side effects such as Headache, dizziness, breast tenderness, nausea, Breakthrough bleeding, decreased libido, mood swings. Then there are women who don't get ANY of the side effects. If anything, monitor yourself while taking it. If you do get some of the side effects, and they don't in time go away, and you cannot handle them anymore, then speak with your doctor about a different form, or brand. [ Rena-Chan's advice column | Ask Rena-Chan A Question ]
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