Boosting hormone levels
The treatment involves a series of drugs designed to artificially boost hormone levels. The main types of hormones involved are estrogens, progesterone or progestins, and sometimes testosterone.HRT is also used by transgendered or transsexual people to aid them in attaining the secondary sex characteristics of their desired sex.
 It is also given to some intersex people (depending on the precise intersex condition), either starting in childhood to reinforce the gender they were assigned, or later, if this gender assignment has proven to be incorrect.
HRT is available in various forms
It generally provides low dosages of one or more estrogens, and often also provides either progesterone or a chemical analogue, called a progestin. Testosterone may also be included. In women who have had a hysterectomy an estrogen compound is usually given without any progesterone, a therapy referred to as "unopposed estrogen therapy".
How is HRT administered?
HRT may be delivered to the body via patches, tablets, creams, troches, IUDs, vaginal rings, gels or, more rarely, by injection. Dosage is often varied cyclically, with estrogens taken daily and progesterone or progestins taken for about two weeks every month or two; a method called "sequentially combined HRT" or scHRT. An alternate method, a constant dosage with both types of hormones taken daily, is called "continuous combined HRT" or ccHRT, and is a more recent innovation. Sometimes an androgen, generally testosterone, is added to treat reduced sexual desire/(libido). It may also treat reduced energy and help reduce osteoporosis after menopause.
