November 26, 2015
font size

Hormonal Methods of Birth Control (cont.)

Medical Author:
Medical Editor:

How is the pill taken?

No matter which type of birth-control pill a woman uses, she should take it every day at the same time in order to establish a routine. The woman needs to minimize the chance she will forget to take the pill, which is not an uncommon occurrence. This is especially critical in the case of the progestin-only pill (minipill). Forgetting to take the minipill, or taking it at varying times of the day, can significantly impair its effectiveness in contraception. This is due to the low dose of the minipill causing its effects to wear off rapidly if the pill is missed.

How long will it take before the pill prevents conception?

  • When a woman begins taking the pill, she may not protected from pregnancy until she has been taking the pill for 10 consecutive days in a row. If a woman forgets to take a pill after she has started, she may be at risk for getting pregnant.
  • If she only misses one pill, she should take it as soon as she remembers, even if it means taking two pills in the same day.
  • If she misses two pills, she should take both of them as soon as she remembers, plus the pill for that day at her regular time.
  • If she misses three pills, she should discontinue use of the pill for four more days to complete one week and then begin taking a new pack of birth control pills, whether she has a menstrual period or not. She must use an alternate form of birth control or abstain from sexual activity during the week that she stops taking her pills.
  • If a woman continually forgets to take her pills, perhaps she should consider a different method of birth control.

What drugs or conditions reduce the effectiveness of the pill?

  • The pill may partially lose its effectiveness if a woman vomits or has diarrhea for any reason.
  • Some medications, including certain sedatives and some antibiotics such as penicillin and tetracycline, may reduce the effectiveness of the pill. Research in this area is ongoing.

A woman should ask her healthcare professional about these matters and the necessity of using a backup method of birth control if any of these conditions exist.

What are the benefits of taking the pill?

There are a number of benefits to taking the pill. Both the combination pill and the minipill can regularize a woman's menstrual cycle and reduce her menstrual flow and menstrual cramps. There is evidence that the pill protects against cancer of the ovary and uterus as well as pelvic inflammatory disease (PID) and iron deficiency anemia.

The combination pill can reduce:

According to several studies, the combination pill confers no long-term risk of breast cancer for women at average risk. In addition, a woman who has taken the pill is less likely to develop rheumatoid arthritis and osteoporosis.

Users of oral contraceptives have experienced significant decreases in excessive menstrual flow and in occurrence and severity of menstrual cramps.

When will my I start having periods again after I quit taking the pill?

  • A woman's menstrual periods should begin again within about 3 months of stopping the oral-contraceptive pill. However, the length of delay before a woman's period returns after stopping the pill varies from woman to woman.
  • Oral contraceptives are about 97% effective in preventing pregnancy. The pill does not protect a woman against sexually transmitted infections.
Medically Reviewed by a Doctor on 2/2/2015


Women's Health

Find out what women really need.

Use Pill Finder Find it Now See Interactions

Pill Identifier on RxList

  • quick, easy,
    pill identification

Find a Local Pharmacy

  • including 24 hour, pharmacies

Interaction Checker

  • Check potential drug interactions
Search the Medical Dictionary for Health Definitions & Medical Abbreviations