Does Testosterone Therapy Affect Fertility? What Men Need to Know

Many men are surprised to learn that testosterone replacement therapy (TRT) can lower sperm production.

If a patient plans to have children, this conversation needs to happen before starting therapy.

Why TRT Impacts Fertility

When a man takes external testosterone, the body reduces its own natural production. This can suppress signals from the brain (LH and FSH), which are necessary for sperm production.

The result:

• Reduced sperm count

• Possible infertility while on therapy

• Testicular shrinkage in some cases

For some men, sperm production returns after stopping TRT — but not always immediately.

Who Should Be Cautious?

Men who:

• Are actively trying to conceive

• Plan to have children in the future

• Have borderline fertility already

These patients need a different approach.

Are There Alternatives?

Depending on the situation, options may include:

• Clomiphene

• hCG

• Monitoring without TRT

Treatment should match the patient’s goals — not just their testosterone number.

If preserving fertility matters, it should be part of the treatment plan from day one.