Medroxyprogesterone side effects
Pro Research Analysisby 
Searched over 200M research papers
Common Side Effects of Medroxyprogesterone Acetate (MPA)
Medroxyprogesterone acetate (MPA) is widely used for contraception, hormone therapy, and treatment of various gynecological conditions. The most frequently reported side effects include irregular bleeding, amenorrhea (absence of periods), and weight gain. Many users experience unpredictable bleeding patterns, especially during the first months of use, but these often decrease over time 346. Other common complaints are breast tenderness and vaginal bleeding, particularly when MPA is used in hormone replacement therapy .
Less Common and Unexpected Adverse Effects
Recent large-scale safety analyses have identified several less common and previously unreported side effects. These include bone pain, gait disturbances, dental caries, decreased blood pressure, and osteonecrosis. Some users have also reported unintended pregnancies while on MPA, though this is rare . Additionally, rare events such as acquired diaphragmatic eventration have been noted .
Cancer Risks and Other Serious Concerns
MPA use has been associated with an increased reporting of certain cancers, such as breast and ovarian cancer, in pharmacovigilance databases. However, the evidence is not conclusive, and further research is needed to clarify these risks . There have also been reports of abnormal cervical cytology and carcinoma in situ, with rates higher than in the general population .
Mood and Psychological Effects
Most studies find no consistent evidence that MPA causes significant negative mood or psychological side effects in the general population. Some women may experience mood swings or negative mood changes, but these effects are generally mild and not consistently different from placebo or other progestins 57810. In hormone therapy, MPA may cause more physical symptoms than some other progestins, but is often preferred for its milder mood effects in women without a history of premenstrual syndrome .
Effects in Special Populations
In transgender women, MPA is associated with minimal side effects and is effective in lowering testosterone levels, supporting its use in gender-affirming therapy. Some users report improved breast development and reduced facial hair, with only a few experiencing mood swings .
Bone Health and Metabolic Effects
MPA can have effects on bone health, especially with long-term use. Some studies suggest a possible bone-sparing effect when MPA is combined with other treatments, but bone pain and osteonecrosis have also been reported as rare side effects 19. Weight gain and increased body fat mass are also associated with MPA use .
Conclusion
Medroxyprogesterone acetate is generally well tolerated, with the most common side effects being irregular bleeding, amenorrhea, and weight gain. Less common but potentially serious side effects include bone pain, dental issues, and rare cancers. Mood changes are generally mild and not consistently linked to MPA. Ongoing research and patient-centered counseling are important to address both common and rare side effects, ensuring informed decision-making for users.
Sources and full results
Most relevant research papers on this topic