The most common type is skin gel, which is used by about 70 out of 100 patients. The gel is rubbed onto your shoulders or upper arms after a shower. About 17 out of 100 patients use shots and 10 out of 100 use patches. About 3 out 100 patients use testosterone in other forms, such as patches or pellets placed in the body. At this time, pills are not approved for use in the .
You should not take testosterone for non-medical reasons, such as body building, preventing aging changes or performance enhancement. Men should not take TRT if they have normal testosterone levels or if their testosterone levels have not been tested. If you have normal testosterone levels, using TRT will not help your health problems. Also, if you are trying to father a child, you should not be on TRT. TRT can decrease your sperm count and fertility.
Before you take TRT, a doctor who is skilled in diagnosing low-T should examine you carefully. Your doctor should not prescribe TRT without taking an in-depth health history and giving you a physical exam and blood tests. Many of the symptoms for low-T can be the result of other health problems. Other causes of symptoms need to be ruled out before testosterone is prescribed.
Before you start TRT, your doctor should talk to you about possible side effects. Side effects can include:
Other significant adverse effects of testosterone supplementation include acceleration of pre-existing prostate cancer growth in individuals who have undergone androgen deprivation; increased hematocrit , which can require venipuncture in order to treat; and, exacerbation of sleep apnea .  Adverse effects may also include minor side-effects such as acne and oily skin, as well as, significant hair loss and/or thinning of the hair, which may be prevented with 5-alpha reductase inhibitors ordinarily used for the treatment of benign prostatic hyperplasia , such as finasteride .  Exogenous testosterone may also cause suppression of spermatogenesis , leading to, in some cases, infertility.  It is recommended that physicians screen for prostate cancer with a digital rectal exam and prostate-specific antigen (PSA) level before starting therapy, and monitor PSA and hematocrit levels closely during therapy.