Depo is administered IM q 3 months. It is a progesterone-based contraceptive and should not affect breastfeeding. Amenorrhea and menorrhagia are both possible side effects. Many women who use depo for over 2 years have been found to lose bone density, sometimes irreversibly. What is the most likely reason for administering Depo every 3 months?
1) To maintain effective blood levels of the hormone
2) To minimize side effects
3) To prevent bone density loss
4) To synchronize with the menstrual cycle