Birth control pills are oral contraceptives containing the hormones estrogen and progestin or progestin only, and are considered to be one of the most effective methods of birth control.

Pregnancy occurs after the eggs, released by the ovaries, are fertilized by the sperm and implanted in the uterus lining. Birth control pills prevent ovulation by altering hormonal levels and the lining of the uterus so the egg cannot plant itself there. They also change the mucus on the cervix to prevent sperm from entering.

Oral contraceptives are considered to be some of the most effective methods of birth control. However, they do not protect from:

• human immunodeficiency virus (HIV)

• Human papillomavirus (HPV)

• sexually transmitted infections.  

You cannot just go to the drugstore and get a pack of birth control pills - they must be prescribed by your ob-gyn based on your medical history and conditions.