Knowra Combined oral contraceptive pill Combined oral contraceptive pill A hormonal contraceptive pill containing estrogen and progestin. It prevents pregnancy mainly by suppressing ovulation and also changes cervical mucus and the uterine lining.
Hypothalamic–pituitary–ovarian axis : The hormonal signaling system linking the hypothalamus, pituitary gland, and ovaries to regulate reproductive function. The pill alters this signaling system to reduce the hormonal surge that triggers ovulation.
Estrogen : A group of steroid hormones involved in reproductive development and regulation of the menstrual cycle. Combined pills pair an estrogen with a progestin to suppress ovulation and stabilize bleeding.
Contraception : Methods and practices used to prevent pregnancy. The combined pill is a reversible, user-controlled method of contraception.
Progestin-only pill : An oral contraceptive containing progestin but no estrogen. It avoids estrogen-related risks but has different formulations and timing requirements.
Ovulation : The release of a mature egg from an ovarian follicle. Suppressing egg release is the pill’s principal pregnancy-prevention mechanism.
Progestin : A synthetic compound with progesterone-like effects, used in hormonal contraception and other treatments. It thickens cervical mucus and contributes to suppression of ovulation.
Combined hormonal contraception : Contraceptive methods that combine estrogen and progestin, including pills, patches, and vaginal rings. The pill belongs to a broader family sharing similar hormonal effects and risks.
Copper intrauterine device : A hormone-free device placed in the uterus to prevent pregnancy, primarily by impairing sperm function. It provides long-acting contraception without the combined pill’s systemic hormones.
Cervical mucus : Fluid produced by glands in the cervix whose consistency changes with reproductive hormones. Progestin thickens it, making sperm passage through the cervix more difficult.
Ethinylestradiol : A synthetic estrogen used in many combined oral contraceptive formulations. It is the estrogen component in many, though not all, combined pills.
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