What are the harms of taking birth control pills to the body?

Patient's question:

Doctor, when you have sexual intercourse, your boyfriend is unwilling to wear a condom. I would like to ask you about the dangers of taking birth control pills and what side effects they have?

Doctor's answer:

Emergency contraception is what we commonly refer to as post-coital contraception. Its effectiveness is approximately 85%. Although the instructions state it should be taken within 72 hours, the later it is taken, the less effective it becomes. Long-term use can cause significant harm to health.
Side effects of birth control pills: Taking birth control pills actually suppresses or disrupts the normal function of the neuroendocrine axis, which interferes with the body. Although an occasional effect is not a problem, it should not be taken frequently.

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