Androderm is a testosterone patch marketed by SmithKline Beecham Pharmaceuticals. Each patch contains 12.2mg testosterone, delivering a nominal 2.5mg/24hr. The normal dosage is two patches every day applied to the stomach, upper back, upper arm, or thighs. The hormones contained in the patch promote retention of nitrogen, sodium, potassium, and phosphorus, and decreased urinary excretion of calcium. They also stimulate the production of red blood cells by enhancing erythropoietin production.
Androderm therapy of the application of patches to a eunuch with no testosterone brings about resumption of normal sexual function (ie. erection) within about three hours. Couples wanting to control sexual activity by a male that is a eunuch or gelding can manipulate hormone levels, sexual function, and desire by application and withholding of Androderm patches. Stopping therapy for one day will result in loss of erectile function within 24 hours.
Women and non-castrated men can, in theory, use these patches to increase their testosterone levels as well. They are, of course, a prescription item.