Hi,
Unfortunately, only finasteride 1mg is approved for the treatment of androgenetic alopecia and not finasteride 5mg.
Higher doses of finasteride will likely be associated with a higher risk of potential side effects such as erectile dysfunction.
As patient safety is the most important in prescribing medical treatment, I would strongly recommend keeping to the standard dose of finasteride 1mg rather than taking a higher dose of 5mg for most patients. Do discuss with your doctor as generic finasteride 1mg offers good value to patients.