Methods to hasten menstruation: daily intramuscular injection of progesterone 20 mg since the 16th day of menstruation or oral progesterone 10-12 mg **** 5 days, 3-7 days after stopping the drug menstruation. Methods to delay the arrival of menstruation:

1. Contraceptive i (compound norethindrone tablets, nethindrone) or ii short-acting oral contraceptives from the 5th day of menstruation open mom, 2 tablets per day for 2 weeks, and from the 3rd week onwards increase the amount of up to 4 tablets per day.

2. Gynecom tablets (norethindrone, nethisterone) or gynecological tablets (megestrol) oral progestational hormones, starting on the 16th day of menstruation, 10 mg per day continuous oral.

3. Mifepristone (mifepristone) non-hormonal, 25 milligrams daily by mouth continuously starting on day 5 of menstruation.

Note that the above 1, 2, 3 method must be taken continuously until after the "critical period" that is discontinued, generally within 7 days after the discontinuation of menstruation. It is worth noting that due to the abnormal application of sex hormones, may disrupt the future menstrual cycle, so these methods can not be used for a long time, not to mention abuse,