Is 5mg finasteride too much?

I went to the doctor today and was prescribed 5mg finasteride orally per day. i was kind of surprised by this because most people seem to take 0.5mg to 1mg per day from what i’ve seen. just want to know if this is considered dangerous or anything. i’m 22m and relatively healthy otherwise. also my hair loss isn’t too crazy mostly just some thinning and temple recession. any input would be appreciated.

In the original Merck studies on finasteride, they showed that the maximum effective dose for hair growth was 1mg. Going up to higher doses did not improve the results but may cause more side effects.  Not a good idea to take the 5mg dose.