Meprate (medroxyprogesterone acetate) can take several days to stabilize the uterine lining and control bleeding. It is common to experience continued spotting or light discharge during the first few days of starting the medication. You should continue taking the prescribed dose, as stopping it abruptly can cause bleeding to worsen. However, since you are still experiencing red discharge after four days, please consult your doctor. They can assess your progress, confirm if the medication is working as intended, or determine if a different treatment or further evaluation is necessary.