Combined injectable birth control
From Wikipedia, the free encyclopedia
Combined injectable contraceptives (CICs) are a form of hormonal birth control for women. They consist of monthly injections of combined formulations containing an estrogen and a progestin to prevent pregnancy.
Combined injectable birth control | |
---|---|
Background | |
Type | Hormonal |
First use | By 1969 |
Failure rates (first year) | |
Perfect use | 0–0.2%[1] |
Typical use | ? |
Usage | |
Duration effect | 1 month |
User reminders | ? |
Advantages and disadvantages | |
STI protection | No |
Benefits | Especially good if poor pill compliance |
CICs are different from progestogen-only injectable contraceptives (POICs), such as depot medroxyprogesterone acetate (DMPA; brand names Depo-Provera, Depo-SubQ Provera 104) and norethisterone enantate (NETE; brand name Noristerat), which are not combined with an estrogen and are given once every two to three months instead of once a month.[2]
Hormonal contraception works primarily by preventing ovulation, but it may also thicken the cervical mucus inhibiting sperm penetration.[3][4][5] Hormonal contraceptives also have effects on the endometrium,[6][7] that theoretically could affect implantation.[8][9][10][11]