How common they are, what the label actually says, and what to do if you notice something.
Find Your ProtocolIt can, but most men don’t have any. The ones men worry about most are sexual: lower sex drive, trouble getting or keeping an erection, and less semen. A smaller number notice breast tenderness or swelling.
Anyone telling you a DHT blocker has zero side effects isn’t being straight with you. Anyone telling you it ruins most men isn’t either.
The FDA label for Avodart (0.5mg dutasteride) comes from large trials in men with enlarged prostates. In the first 6 months:
Those trials were in older men, and the rates dropped after the first 6 months. In a 917-man hair loss trial, 0.5mg dutasteride had side effect rates similar to finasteride 1mg (Gubelin Harcha et al., J Am Acad Dermatol, 2014).
In head-to-head hair loss trials, the rates were similar. Dutasteride lowers more DHT, so it’s reasonable to expect a similar or slightly higher chance of side effects in some men. That’s why your physician reviews your history before prescribing, and why the dose is set for you, not by default. Dutasteride vs. finasteride →
Higher doses mean more drug exposure, which can change both the benefit and the risk. There’s much less long-term, hair-loss-specific safety data at 1.5mg and 2.5mg than at 0.5mg. That’s why higher doses need your physician’s sign-off, and why most men start lower and step up only if they need to. How to choose your dose →
For most men who notice something, it fades over the first few months or goes away after lowering the dose or stopping. Some men report effects that continue after stopping. Because dutasteride stays in your body for months (its half-life is about 5 weeks), anything you notice won’t disappear overnight.
Tell your physician through your patient portal right away. Don’t just push through it. Options include lowering the dose, adjusting your protocol, or stopping. You can also reply to any MANE & STEEL email and we’ll connect you.
Some men report low mood or depression while taking 5-alpha reductase inhibitors. If you notice changes in your mood, tell your physician, and get help right away if you have thoughts of harming yourself.
Yes. Dutasteride lowers PSA, the prostate cancer screening number, by about half, so any doctor checking your PSA needs to know you take it. In a large prostate trial (REDUCE), men on dutasteride had a small increase in high-grade prostate cancer, which the FDA label lists as a warning. Keep up with normal screening as you get older.
Women and children. Women who are or may become pregnant shouldn’t even handle the softgels, because dutasteride can be absorbed through the skin and can affect a male baby’s development. You also can’t donate blood while taking it or for 6 months after your last dose. Full drug safety information →