Testosterone injections are administered by injecting the sex hormone into muscle tissue, typically in the major muscles of the thigh, hip, upper arm or buttocks, according to Drugs.com. The injections are used in males to treat delayed puberty, impotence or hormonal imbalances. Women may receive injections to treat breast cancer that has spread to other parts of the body.
The administration of testosterone injections commonly occurs every two to four weeks, according to Drugs.com. The length of treatment is dependent upon the health condition being treated. Routine blood tests are used by health care providers to monitor the effectiveness of the treatment. Several health conditions may stop health care providers from prescribing this treatment. These conditions include prostate cancer, male breast cancer or certain heart conditions. Advanced liver or kidney disease may also eliminate an individual as a suitable candidate.
Numerous side effects may occur when testosterone is administered, according to Drugs.com. These side effects may occur in men or women and include swelling of the breasts, headaches, increased body hair, changes in sexual libido, numbness, male-pattern balding or pain or swelling at the injection site. It is also possible to experience an allergic reaction to testosterone. Medical attention should be sought immediately if hives, breathing difficulties or swelling of the face, lips, tongue or throat occurs.