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Does the contraceptive pill increase your risk of blood clots?

Contraceptive medicines

Contraceptive medicines contain female hormones that are taken by women to prevent pregnancy from occurring. Hormonal contraception is available as tablets, patches, long-acting injections, implants and intra-uterine devices. Oestrogen-based hormones such as ethinylestradiol work to prevent ovulation whilst progestogens such as norethisterone affect the womb to make fertilisation and implantation of an egg less likely.