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A 18-year-old female asked:

I have never taken birthcontrol pills, my question is when should i take the first tri-sprintec tablet? and how long do i have to wait so it works

1 doctor answer1 doctor weighed in
Dr. Sarah Walton
Pharmacology 6 years experience
Sunday is the norm..: You can technically start anytime and your cycle will adjust to the medication. But most women find it easiest to start on a Sunday, the way the packs come labeled. You should take it the first Sunday after the start of your period. You should use a second form of birth control for 2 weeks. It may take several months before your cycle is regulated on the pill.

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Last updated Aug 13, 2016

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