What is the contraceptive rate of birth control pills?

Patient's question:

Please ask if having sex after taking birth control pills is absolutely impossible to get pregnant? Please ask which brand of birth control pills is good to take during sex? Mainly good efficacy and no side effects~
Hope to introduce several to me as soon as possible.
First question supplement: Which one is better to take? "Mefloquine" or something?

Doctor's answer:

The success rate of emergency contraception varies from person to person and is not 100%. Additionally, due to its high hormone content, side effects such as menstrual disorders and endocrine imbalances may occur in some individuals after taking it. Therefore, it is not recommended as a regular or first-line method of contraception. It is generally advised not to use it more than three times a year and not more than twice in a short period. If used excessively frequently, it not only reduces the effectiveness of contraception but also increases the risk of ectopic pregnancy.

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