Medroxyprogesterone acetate tablets are clinically known as progesterone and are not usually used to prevent menstruation while taking the medication. If you get your period while taking the medication, there are several cases: First, the dose of medication taken is not enough to cause your period. Secondly, there is a case of missed dose during the course of taking the medication. Third, because the endometrium has already thickened before taking the medication, clinically, menstruation is imminent, so taking the medication is not able to stop the shedding of the endometrium, it will cause the endometrium to shed and clinically, menstruation will occur. This is the reason why you clinically come to menstruation when you are taking progesterone. In the vast majority of cases, menstruation will not occur during the medication period as long as the medication is taken as prescribed by the doctor. Once menstruation occurs, it is advisable to stop taking the drug as soon as possible.