I have fine hair and wondering if Propecia will help thicken it? I have a receding hairline but am not balding.

The double blinded trials which led to FDA approval of finasteride for use in hair loss used hair counts as a primary end point, but not hair thickness.  A later study did find an increase in hair weight for men using finasteride which might imply thicker hair.   I have included a web reference to this study below. 

Dear moveoverkenny,

Thank you for your clinical post. This is a common complaint amongst male
patients of fine hair, which is thinning and some degree of recession. In general, for males with this condition the
use of Finasteride also known as Propecia combined with vasodilatation in the
form of Minoxidil and low-level light therapy and plasma rich protein
injections with topical nutrient hair serums can provide some increased hair
density as well as moderate thickening of the hair. If patients who are female and suffering from
diffuse thinning then the use of Minoxidil, Spironolactone and search for
non-genetic causes of thinning may be of some benefit.

It is extremely important that you seek out the expertise of
a hair loss physician most likely a dermatologist and in Toronto an excellent
source would be Dr. Donovan to ensure that you’re not a non-surgical candidate
for some of these non-surgical hair optimization techniques.

Diffuse thinning, recession and loss will ultimately result
in candidacy for hair transplantation and we have one of the largest
experiences of follicular unit extraction transplantation in Canada. One of the advantages of this technique is
the absence of a linear scar at the back of the scalp with the use of robotic
and automated harvest techniques the donor site can be excellent. However, you may never come to this point as
you may not recede or thin extensively enough and non-surgical techniques at
this point seem to be your best option.

I hope this information has been of some assistance and best
of luck.

For more information, please review the link below.

R. Stephen Mulholland, M.D.

Certified Plastic Surgeon

Yorkville, Toronto