What is your experience with using 5 alpha reductase inhibitors in females of childbearing age for androgenetic alopecia?   

I have avoided finasteride in young women with pattern alopecia, though low dose oral minoxidil has been safe/effective in several instances over the past year (for both pattern alopecia and chronic telogen effluvium in women of childbearing age). 

I do not offer finasteride or dutasteride for patients of childbearing age. The risks outweigh the benefits. There are many other safe options available.