A contraceptive is any device or treatment that prevents pregnancy during its use. It excludes procedures that cause permanent infertility such as tubal ligation or vasectomy.

Some of the most common and effective forms of contraception in use are:

No form of contraception is foolproof, 100% effective or without side effects. Hoewver, properly used, these four are 99% or more effective.

On House, M.D., some patients suffered adverse side effects from their contraceptive use:

Birth control at Wikipedia

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