Testosterone is a medication and naturally occurring steroid hormone It is used to treat male hypogonadism and certain types of breast cancer. It may also be used to increase athletic ability in the form of doping
.It is unclear if the use of testosterone for low levels due to aging is beneficial or harmful. Testosterone can be used as a gel or patch that is applied to the skin, injection into a muscle, tablet that is placed in the cheek, or tablet that is taken by mouth.
Common side effects from testosterone medication include acne, swelling, and breast enlargement in males. Serious side effects may include liver toxicity, heart disease, and behavioral changes
Women and children who are exposed may develop virilization. It is recommended that individuals with prostate cancer not use the medication. It can cause harm to the baby if used during pregnancy or breastfeeding.