Para imprimir: Use la función de imprimir de su navegador de Internet. Cierre esta ventana después de imprimir.

Progestin-Only Hormonal Methods (Mini-Pills, Implants, and Shots)

Índice de Materias

Progestin-Only Hormonal Methods (Mini-Pills, Implants, and Shots)


Oral contraception

Nombre genéricoNombre de marca
norethindroneMicronor, Nor-QD,


Nombre genéricoNombre de marca
etonogestrelImplanon, Nexplanon


Nombre genéricoNombre de marca

For information on combination birth control pills, see Birth control pills, patch, or ring.

How It Works

Progestin-only birth control methods, including pills (called "mini-pills"), implants, and shots, prevent the ovaries from releasing an egg (ovulation), thicken mucus at the cervix so sperm cannot enter the uterus, and in rare cases, prevent a fertilized egg from implanting in the uterus.

Birth control mini-pills

Progestin-only mini-pills come in a monthly pack. To be effective, the pills must be taken at the same time each day. If you take a pill more than 3 hours late:


The progestin-only implant releases hormones that prevent pregnancy for 3 years. The actual implant is a thin rod about the size of a matchstick. This is inserted under the skin on the inside of the upper arm.


The birth control shot, such as Depo-Provera, is effective for 12 to 13 weeks.

Why It Is Used

Progestin-only mini-pills, implants, and shots are good choices for women who:

How Well It Works

Shots and implants are highly effective methods of birth control.

Progestin-only mini-pills are very effective, but combination hormone pills are even more effective. Also, the mini-pill has to be taken at the same time every day to work correctly.

The shot

This method is highly effective, unless you fail to get a shot after 3 months.2

Progestin mini-pill

This method is very effective, but you must take the mini-pill at the same time every day.2


This method is extremely effective and lasts for 3 years.2

Medicines that can interfere with hormonal birth control

Some combinations of medicine may affect the birth control hormones in your body, making them too strong or too weak. This may increase your chance of becoming pregnant. Or a new medicine may be less likely to work because you have birth control hormones in your body. Talk with your doctor or pharmacist to make sure that the medicines you take are not causing problems when you are using hormonal birth control.

Side Effects

Most side effects of the progestin-only birth control methods go away after the first few months of use. Side effects include:

Less common progestin side effects include depression and darkening of the skin on the upper lip, under the eyes, or on the forehead (chloasma).

Risks of the shot

Bone thinning. Use of the shot for 2 or more years can cause bone loss, which may not be fully reversible after stopping the medicine.3

For teens, bone loss from the shot is a concern. Teens are normally building bone mass as they grow. This is why it is very important for teens to get enough calcium and vitamin D when using the shot. A small study among teens showed that bone loss from the shot was reversed after the teens stopped getting the shots.4 Talk to your doctor about your risk if you have been using the shot for longer than 2 years.

Progestin risk after having gestational diabetes

Breast-feeding women can use the mini-pill or shot without worrying about effects on their milk supply or the baby. But using progestin-only birth control after having gestational diabetes appears to make it more likely that you will develop diabetes.1

See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)

What To Think About

Progestin-only mini-pills may not be as effective if you are vomiting or have diarrhea. Use another method of birth control for 7 days after vomiting or diarrhea, even if you have not missed any pills.

Complete the new medication information form (PDF) to help you understand this medication.



  1. Raymond EG (2007). Progestin-only pills. In RA Hatcher et al., eds., Contraceptive Technology, 19th ed., pp. 181–191. New York: Ardent Media.

  2. Trussell J (2007). Choosing a contraceptive: Efficacy, safety, and personal considerations. In RA Hatcher et al., eds., Contraceptive Technology, 19th ed., pp. 19–47. New York: Ardent Media.

  3. U.S. Food and Drug Administration (2004). Depo-Provera contraceptive injection (medroxyprogesterone acetate injectable suspension). Safety Alerts for Human Medical Products. Available online:

  4. Scholes D, et al. (2005). Change in bone mineral density among adolescent women using and discontinuing depot medroxyprogesterone acetate contraception. Archives of Pediatrics and Adolescent Medicine, 159(2): 139–144.

Créditos para Progestin-Only Hormonal Methods (Mini-Pills, Implants, and Shots)

By Healthwise Staff
Primary Medical Reviewer Sarah Marshall, MD - Family Medicine
Specialist Medical Reviewer Femi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology
Last Revised May 3, 2012

Nota: El "documento para imprimir" no contiene toda la información disponible en el documento en línea. Parte de la información (por ejemplo, referencias a otros temas, definiciones o ilustraciones médicas) sólo está disponible en la versión en línea.

© 1995-2014 Healthwise, Incorporated. Healthwise, Healthwise para cada decisión de la salud, y el logo de Healthwise son marcas de fábrica de Healthwise, Incorporated.Esta información no reemplaza la consulta médica. Healthwise, Incorporated niega toda garantía y responsabilidad por el uso de esta información.