
Per the CDC, roughly 1 in 4 sexually active American women have used the form of birth control Depo-Provera. Studies, though, found that the effects of this injectable go beyond contraception. The government paper trail also keeps growing, regarding the risks it may cause. A JAMA Neurology study found a 2.43-fold higher risk for developing a brain tumor among users. Just this month, on July 2, 2026, another JAMA study flagged the injection as having the strongest risk of brain tumor development of any contraceptive. (This study also reported reassuring news: risk fades within roughly five years of stopping. Additionally, absolute risk stays low, as less than 5 in 10,000 women have this extremely negative effect.)
According to the Mayo Clinic, “Depo-Provera is a birth control shot that has the hormone progestin.” In actuality, it injects medroxyprogesterone acetate, a synthetic version of the natural hormone progesterone. Long-term use of this injection can result in meningiomas, which are usually benign brain tumors. Meningiomas, though, can crowd the brain, triggering headaches, vision loss, and seizures. In December 2025, the U.S. Food and Drug Administration ordered a warning on the Depo-Provera label.
Meanwhile, Pfizer reached a June 2026 settlement covering over 5,500 federal lawsuits alleging it downplayed the danger. Though this number may seem large, the percent of Depo-Provera users it represents is small. So, users shouldn’t panic but should talk to their doctor about duration of use.










