Women who have trouble dealing with the side effects of traditional combination birth control pills are sometimes referred to the progesterone-only pill. Because this pill only contains progestin, and doesn't contain estrogen, it may not have as many side effects as combination birth control pills, according to the American Academy of Family Physicians. However, some side effects do occur when taking this pill, and some of those side effects may be serious. Always discuss all potential risks with your doctor before taking this pill.
Common Side Effects
Breakthrough bleeding is a common side effect of the mini pill. It refers to any unexpected vaginal bleeding that occurs in the middle of the menstrual cycle. This breakthrough bleeding may be be worse if you do not take the pill at the exact same time each day, or miss a pill. However, if the pill is taken at the same time consistently, breakthrough bleeding should become less frequent as the body adjusts to the new hormone change. Other common symptoms include breast tenderness and hunger, which may cause weight gain in some women, according to the American Academy of Family Physicians.
Less Common Side Effects
The less common side effects are usually not cause for concern, unless they persist or become bothersome. They include headaches, upset stomach and mood changes, according to Family Health International. In addition, acne and increased hair growth may also occur, according to Medline Plus.
Serious Side Effects
Although uncommon, the progesterone-only birth control pill does have the risk of serious side effects, according to Medline Plus. These side effects include bleeding that lasts for an extended period of time, a complete lack of menstrual periods or severe stomach pain.
Effectiveness
The mini pill is less effective than traditional birth control pills, especially if taken late or incorrectly. If you take the pill even just three hours later than you usually do, you'll have to use another form of contraception as backup for the next two days, according to Medline Plus.
