TRT Side Effects: The Real List and What to Do
Testosterone replacement therapy is well tolerated for most men. Here are the side effects that actually matter and the ones that don't.
Hematocrit
Testosterone stimulates red blood cell production. In a small subset of men, hematocrit climbs above 52–54%, which can increase clotting risk. Practitioners monitor at baseline, 3 months, and every 6 months. Donating blood or reducing dose corrects it.
Estradiol
Some testosterone converts to estradiol via aromatase. Most men's estradiol stays in a healthy range. A subset, usually higher body fat, converts enough to feel symptoms. A small dose of anastrozole or a dose reduction corrects it.
Acne and water retention
Common at start-up. Usually settles by month 3. If it doesn't, dose adjustment fixes it.
PSA
TRT does not cause prostate cancer. Modern literature is clear on this. PSA can rise slightly. Practitioners track it; significant rises trigger urology referral.
Sleep apnea
TRT can worsen existing obstructive sleep apnea. Men with significant snoring or daytime sleepiness should be screened.
Frequently asked questions
Is TRT dangerous for the heart?
Recent large trials (TRAVERSE, 2023) found TRT did not increase major cardiovascular events in men with hypogonadism.
Will TRT cause hair loss?
It can accelerate androgenetic alopecia in genetically susceptible men. Finasteride addresses it.
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