The combined oral contraceptive pill includes two hormones -- estrogen and progestin. These hormones work together to stop ovulation, or the release of an egg, and limit the sperm's movement. Although this pill is a good way to prevent pregnancy, it does not protect against sexually transmitted diseases or HIV. It is recommended that condoms be used in conjunction with these pills.

When prescribed and taken properly, this kind of birth control pill has many benefits; among them are decreasing a woman's risk for ovarian cancer and reducing the chance of benign breast masses. The pill can clear acne and make premenstrual cramps more bearable.

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But with these attractive features come some issues as well. One of the biggest problems with the pill is remembering to take it at the same time each day. If you ingest it a few hours later than your normal schedule, you could be unprotected. This means you run the risk of ovulating and potentially becoming pregnant.

Additionally, the combined birth control pill can cause:

• nausea;
• spotting;
• headaches; and
• depression.

Blood clots are also a risk that can occur from taking this pill, though it is rare. Smokers are 1 risk group who should not take the pill.