Hormone Therapy for Transgender Males

Effects of Testosterone Over Time

The graphics below show the effects that testosterone may have on your body and an approximate timeline of these changes. 


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Frequently Asked Questions

Testosterone has two main jobs:

1) It causes masculinizing changes to occur throughout the body.

2) It suppresses the production of estrogen. Some of the changes caused by testosterone are permanent (they would remain if testosterone was stopped), and other changes are reversible.

Testosterone is available as gel injections or cream. Injections are administered either every 2 weeks intramuscularly (into the muscle) or every week subcutaneously (under the skin). Nursing staff provides injection training at the clinic. Cream and gels are absorbed through the skin and are applied daily.

Testosterone causes voice deepening, clitoral growth, body/facial hair growth and sometimes male-pattern balding (also influenced by age, genetics). Testosterone may irreversibly affect fertility. Desires for fertility should be considered prior to starting hormones, and for those seeking fertility preservation (or education about fertility preservation), referrals can be made to Lurie Children’s Fertility Preservation Program.

Testosterone causes increased muscle tone, fat redistribution (moves from the hips to the stomach area), skin oiliness and acne. Mood changes (often irritability, having a “shorter fuse”) and heightened sex drive may occur. Menstrual cycles will change and eventually stop after some time. There may be genital changes caused by low estrogen levels.
Testosterone may increase your metabolic risk profile – that is, the risk for conditions such as heart disease, diabetes, high cholesterol or blood pressure. The risk for heart disease is higher for people who smoke cigarettes, are overweight or have a family history of heart disease. Testosterone causes hematocrit, the proportion of red blood cells in a volume of blood, to increase. This blood thickening, at high levels, can be life-threatening, causing stroke or a heart attack. Testosterone can also cause increased appetite, headaches and acne.
Labs (bloodwork) are collected prior to starting hormones and every 3 months for the first year of treatment. In the second year, labs are checked every 6 months. Tests that are monitored include cholesterol, liver tests, hematocrit and hormone levels. These labs can be drawn at Lurie Children’s or at a local facility.
Remember, it’s normal to want to see changes occur rapidly, but (just like in puberty) these changes take time! Most changes start to begin about 3-6 months after starting testosterone, and take years to fully develop.
Remember, everyone experiences puberty differently. Factors other than testosterone (such as genes!) affect appearance. It’s impossible to predict exactly what changes will develop. It’s important to take the prescribed dose of testosterone. Taking more increases health risks. Always tell your healthcare provider if you have questions or concerns about your health.

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Hormone Therapy for Transgender Males