Progestin-only birth control pill
By Mayo Clinic staffThe progestin-only birth control pill, also known as the minipill, is an oral contraceptive taken daily that contains only one hormone, progestin. This is the only type of oral contraceptive recommended for breast-feeding mothers because it contains no estrogen, which is known to interfere with milk supply.
Effectiveness rate. The failure rate of the minipill is low, especially if the user follows the directions and misses no pills. Among typical users of progestin-only pills, the effectiveness rate is 92 percent, meaning that eight out of 100 women taking it for one year will get pregnant.
Side effects and health risks. The major side effect associated with the progestin-only pill is irregular menstrual bleeding. Periods often become short and light, and some women don't bleed for several months at a time. However, some women experience persistent spotting. Other side effects include weight gain, breast tenderness and depression. Women who take the minipill don't experience the side effects caused by estrogen, such as an increased risk of blood clots and cardiovascular disease. The minipill doesn't protect against STDs.
How to use the minipill. If you decide on the minipill, your doctor determines which formula best meets your needs. Take the pill according to the most recent package insert, which provides instructions on when to begin the pill, whether you need backup contraception at certain times and what to do if you miss pills.
Cost and availability. Progestin-only pills cost $30 to $60 a month. The initial examination costs $35 to $175.
