The medicines in this section act on the female and male reproductive systems. They include hormone containing contraceptives and medicines such as sildenafil and tadalafil for erectile problems. Medicines such as nafarelin and clomifene are used to help couples with fertility problems. Hormones such as norethisterone and ethinylestradiol are common treatments for painful or heavy periods. Oestrogen and progestogen HRT helps relieve menopausal symptoms.