In recent years new protocols of post-coital hormonal contraception have been devised that cause fewer side-effects. 0.2 mg ethinyl-estradiol with 2 mg norgestrel twice within 72 hours after intercourse were among the first combinations that would utilize low doses of hormones. Other authors use even smaller doses; preparations for intramuscular injection are available if the woman vomits the tablets. Progesterone has been used alone within 12 hours following intercourse with a success rate close to estrogen-progestin combinations. Quingestanol acetate is used for 5 days, 0.9-1.5 mg/day. With danazol fewer side-effects are seen; 400 mg are taken twice within 72 hours with a good rate of success.