Progesterone may help to build bone density, reduce blood pressure, lower LDL cholesterol, improve the appearance and texture of hair and skin, aid libido and prevent PMS. When balanced properly Slynd is a progestin only birth control pill (oral contraceptive). Slynd help to lower the chance of becoming pregnant when taken as directed. If you miss 2 or more active pills in a row, take only the last of the missed pills as soon as you remember. From the next day forward, take 1 pill per day for the rest of the pack (throw out the As it says on the tin the progesterone-only pill contains just the synthetic hormone progestin. Both types of pills are taken daily, with most brands of combined pill being taken for 21 days and with a 7 day break, during which you may have a withdrawal bleed. The POP is taken for 28 days continuously, without any breaks. Norethisterone dosage. Breast cancer: 40 mg daily increasing to 60 mg daily if no regression is noted. Contraception: 0.35 mg daily, or 0.5-1 mg daily when combined with oestrogen. As acetate: 0.6 mg daily, or 1-1.5 mg daily when combined with oestrogen. Premenstrual syndrome: 5 mg tid on days 16-25 of cycle. NpAs.