My testosterone doubled in 3 years

I have been taking finasteride for 3 years and it has helped me a lot in stopping my hair loss. However, after my last check, it turned out that my Testosterone (from 24.82nmol/l to 40.79nmol/l) and free testosterone (443.6pmol/l to 821.9pmol/l) have increased since my last check. My doctor has advised me to come off finasteride for 4 months until my next check up, although I suspect that such a period of time will definitely ruin my hair again. I know I did strength training the night before the blood test, is it possible that it raised the test levels that high? I don’t want to go off it for that long when I know it works great for me.

Testosterone levels often rise when taking finasteride.  Stopping finasteride for 4 months may be a disaster for your hair as hair loss is almost a certainty if you have had significant benefits from taking the finasteride (these benefits will reverse).  I don’t believe that your doctor understands the drug finasteride, and he/she needs to get educated about it.