Anastrozole for men: What does this medication do?

What is this stuff, anyway?

Anastrozole is an aromatase inhibitor. That is just a fancy way of saying it stops a specific enzyme—a protein that speeds up chemical reactions—from turning your testosterone into estradiol, which is a form of estrogen.

While the FDA approved it for treating breast cancer, some doctors are using it off-label for men. Off-label means a doctor prescribes a drug for something other than its officially approved purpose.

Why would a man take it?

This isn't for everyone. It is usually reserved for men who have high levels of estradiol or men who have obesity-related aromatization.

That last part is just a clunky way of saying their body is turning too much testosterone into estrogen because of extra body fat. The goal here is to lower that estradiol and potentially raise your body's own testosterone and gonadotropins, which are hormones that tell your body to keep things running properly.

Does it actually work?

Scientists are still working on this one—turns out the human body is complicated. Who knew? Small controlled studies have shown that it can improve hormone levels and sometimes even help with semen parameters, which is just a professional way to talk about sperm health.

However, the evidence is still limited. Here is what we know so far:

• It stops the swap: It inhibits an enzyme called CYP19 to stop testosterone from turning into estrogen.
• It is not for everyone: Doctors usually save this for specific cases, not as a routine addition to testosterone replacement therapy.
• Bone health matters: If you lower your estrogen too much, it can cause problems with your bones.

The bottom line

TruthTides gives Anastrozole a Grade: C. This means while there is some evidence it helps, we are still waiting for more robust data. It is typically taken at a dose of 1 mg daily or even less frequently, depending on what a professional thinks.

This is a great one to bring up with your doctor. You can find peptide-experienced physicians in our Find a Doctor directory.

This content is sourced exclusively from TruthTides clinical reference data and does not constitute medical advice.