What are progestin-only pills?
Progestin-only pills contain one hormone, a progestin. They work by thickening
the cervical mucus so sperm cannot reach the egg, and by making the lining
of the uterus thinner. Sometimes they stop ovulation (the release of an
egg). Among typical couples who use progestin-only pills about 5% will experience
an accidental pregnancy in the first year. This is because some women do
not take their pills correctly. But if these pills are used consistently
and correctly, just one in 200 women will become pregnant.
Complete information about this contraceptive is available from your
clinician or the package insert accompanying the specific pills you are
taking.
Advantages:
- There are no estrogen side effects with the mini-pill. These pills can
be taken by women who have had side-effects or complications using estrogen-containing
pills.
- The amount of progestin in mini-pills is less than in combined pills.
- Mini-pills are easier to take. You take exactly the same kind of pill
every single day.
- Nursing mothers can take progestin-only pills, preferably after the
baby is 6 weeks old.
Disadvantages:
- Menstrual irregularity is the most common problem with mini-pills. While
there is less blood loss, bleeding may be at irregular intervals and there
may be spotting between periods.
- Mini-pills tend to make periods short and scanty. You may go several
months with no bleeding at all.
- You have to remember to take a pill every single day.
- The failure rate with mini-pills is a bit higher than with combined
birth control pills. Some women use a backup method such as condoms while
they are taking mini-pills.
- Progestin-only pills do not protect you from HIV or other infections.
Use a condom if you or your partner may be at risk.
Where can I get mini-pills?
In the United States mini-pills require a prescription. You can get a prescription
from your clinician, health department, or family planning clinic.
