This web site is a repository of publicly available information, and is not intended to form a physician-patient relationship with any individual. The content of this website is for informational purposes only. The information presented on this web site is not intended to take the place of your personal physician’s advice and is not intended to diagnose, treat, cure or prevent any disease. Discuss this information with your own physician or healthcare provider to determine what is right for you. All information is intended for your general knowledge only and is not a substitute for medical advice or treatment for specific medical conditions. The information contained herein is presented in summary form only and intended to provide broad consumer understanding and knowledge. The information should not be considered complete and should not be used in place of a visit, call, consultation or advice of your physician or other health care provider. Only a qualified physician in your state can determine if you qualify for and should undertake treatment.
People at high risk of prostate cancer, or with a high prostate blood test (prostate specific antigen or PSA) may need to see a urologist to decide whether testosterone will be safe for monitoring with blood tests and an examination of the prostate is also necessary for everyone over 40. It is extremely important that men do not take supplements of testosterone (such as those used in weight training, body building or available online) other than what has been medically prescribed. Too much testosterone can cause other medical problems.
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.