Understanding Norethisterone for Period Delay Can Periods Be Delayed Intentionally? Yes, they can. The most commonly used medications are progesterone based hormones, such as: Norethisterone Medroxyprogesterone acetate These are usually started 35 days before the expected date Frontiers Mechanisms of endometrial aging: lessons from natural conceptions and assisted reproductive technology cycles Glutathione Benefits, Skin Whitening, Dosage & Side Effects Effective Treatment for Menstrual Cramps Petals Family Clinic