My 21 year old son has been experiencing heavy body hair loss since summer 2011. He took propecia for 13 months stopping in February 2011 due to sexual side effects. He still has significant sexual dysfunction,anxiety, panic attacks and depression. Loss of body hair has been reported to the FDA as a side effect of the drug. This is absolutely devastating for him.
Some people experience side effects from the drug that range from sexual to mood changes. Based on my clinical experience, I am of the belief that side effects disappear upon stopping the drug. There may be other things happening to him that your son’s doctor should assess. I hope he’s seen his prescribing doctor for a follow-up after stopping the medication.