Combined injectable birth control

Combined injectable birth control
Background
Type	Hormonal
First use	about 1980
Failure rates (first year)
Perfect use	0-0.2%
Typical use	?
Usage
Duration effect	1 month
User reminders	?
Advantages and disadvantages
STI protection	No
Benefits	Especially good if poor pill compliance.

Combined injectable contraceptive (CIC) is a monthly injection of progestin and estrogen to suppress fertility.

Depot medroxyprogesterone acetate (DMPA) is a different injectable contraceptive, containing just a progestin, given every three months. It is a progestogen-only injectable contraceptive.

Hormonal contraception works primarily by preventing ovulation, but it may also thicken the cervical mucus inhibiting sperm penetration. Hormonal contraceptives also have effects on the endometrium, that theoretically could affect implantation,

CIC is administered by intramuscular injection into the deltoid, gluteus maximus, or anterior thigh. It is ideally administered every 28 to 30 days, though it has been demonstrated to be effective up to 33 days.

The most prominent side effects are menstrual irregularities during the first 3 to 6 months of use.

CICs that have been marketed include the following:

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