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Injectable hormonal contraceptives contain progesterone or combination of estrogens for parenteral (intramuscular or IM) administration with long-term hormone doses.

It consists in the administration of progesterone alone, parenterally (MI), with contraceptive effect for periods of 1 or 3 months, or a monthly combination of estrogen and progesterone for parenteral (MI).

What are the chances that the injection will fail?

The monthly injection failure rate ranges from 0.1% to 0.6%, meaning that out of every 1,000 women who use it for one year, one to six get pregnant. The quarterly injection failure rate is 0.3%, that is, out of every 1,000 women who use it for one year, only three get pregnant.

Can the injection be bad for your health?

  • Changes in the menstrual cycle: minor bleeding between periods, prolonged bleeding, and amenorrhea (no menstruation)
  • Weight gain
  • Mild headache
  • Dizziness


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