Australian women who developed a type of benign brain tumour after using a popular contraceptive are considering joining a class action against Pfizer. It comes after a major study found women who used Depo-Provera for more than a year had a higher risk of developing a meningioma compared to women who didn't use it. Doctors say while Depo-Provera can be a useful treatment for some conditions, including endometriosis and heavy periods, its long-term use should be carefully considered.