Finasteride and loss of body and beard hair

I have an identical twin brother who never took Fin while I have been on it for four years. He has less hair than I do on his head so I guess the drug is working to stop my hair loss. He has a ferocious beard. I, on the other hand have a pretty light beard with no hair on my cheeks, only on my chin/neck and less body hair than he has. Is it possible that Finasteride could have played a role in this? Did I take Fin at a critical developmental period and miss that window?

Yes, it is possible that finasteride has reduced your body hair and the hair in the beard as it is a known side effect of this drug. If you have an identical twin, talk with him about the timing of your taking the drug and the disappearance of some of your beard hair. By doing this, you can confirm if this is a real finasteride side effect.