Propecia - How long does propecia start to work.

As in start to stop the hair from falling out. Cheers guys

Doctor Answers 7

Propecia, How Long Before It Works?

It starts to work as soon as you begin to take it. It works by blocking the enzyme 5 alpha reductase which converts testosterone to DHT. For results, you will have to wait to see any results. Most will notice results after the first 8 months. You will need to continue taking it for continued benefit.

Seattle Hair Restoration Surgeon
4.9 out of 5 stars 33 reviews

The Three P's for Hair Loss--Propecia, PRP and Progesterone

It can take up to 3 months to see improvement. I suggest seeing an expert to evaluate your hair loss and consider the best treatment options. Propecia works best in combination with other non-invasive options like PRP/progesterone or transplantation. See an expert. Best, Dr. Emer

Jason Emer, MD
Los Angeles Dermatologic Surgeon
4.8 out of 5 stars 196 reviews

How long before Propecia works

Propecia is in your blood stream as soon as you begin taking it.  However, it takes about 3-4 months before it begins to take effect and slow the progression of hair loss.  Be patient, it will take about 6-9 months to see the full effect of the drug.  Also remember, not seeing changes, or more hair is still good news because you are not losing hair - That is the biggest benefit of the drug!

Gregory Michael Bazell, MD
Barrington Plastic Surgeon
4.3 out of 5 stars 13 reviews

How long before propecia starts to work?


It takes about 3 months for propecia to slow the hair loss, and 6-12 months before you see re-growth in the fortunate who have such a response. That is seen in 26% of men who mostly re-grow in the crown area.


Bernardino A. Arocha, MD

Bernardino Arocha, MD, FISHRS
Houston Hair Restoration Surgeon
5.0 out of 5 stars 10 reviews


finasteride works pretty quickly usually for most patients in the first 2-4 weeks of daily use. However, the full effect of the medication will take at least 6 months, even up to 12 months. 

Rae Lynne Kinler, MD
Chicago Physician


This drug starts to work fairly quickly but you might not see the results for 6-12 months while the hair grows out and the miniaturized hairs reverse

William Rassman, MD
Los Angeles Hair Restoration Surgeon
5.0 out of 5 stars 27 reviews

Propecia - How long does propecia start to work.

Approximately 3 to 4 months on average before you see results however sometimes longer. Be patient because a full result takes approximately a year.

William Woessner, MD
New Orleans Hair Restoration Surgeon
5.0 out of 5 stars 5 reviews

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.