Orlistat

Orlistat (Xenical) is a drug introduced in 2000 to treat significant obesity. It acts by preventing the absorption of fat from the intestine. Common side effects include diarrhoea (worse if fat eaten), flatulence, liquid faeces and headache. It should be used with caution in pregnancy and children, with peptic ulcers,…

Continue reading

Oestradiol (Estradiol)

Oestradiol (estradiol in the USA) is a female sex hormone that is produced by the ovaries. It may also be used as a medication in the form of a tablet, patch, gel, cream, nose spray, vaginal pessary, vaginal ring, injection or implant to relieve the symptoms of menopause. The amount…

Continue reading

Oestriol

Oestriol (Ovestin) is a female sex hormone used as a tablet, pessary or vaginal cream for hormone replacement therapy in the menopause. It should not be used in pregnancy, breastfeeding or children, but accidental usage in these situations is unlikely to be harmful. Use oestriol with caution in epilepsy, migraine,…

Continue reading

Oxytocin

Oxytocin (OXT) is a hormone produced in the neurohypophysis, which is part of the pituitary gland under the brain. It acts to start labour in pregnancy, stop excessive bleeding after delivery by contracting the uterus and stimulates milk production by the breasts. A synthetic form can be given as an…

Continue reading