No side effects from Fin, you can start with 5% minox immediately! Remember the main weapon is Fin, so make sure you start both the medicines together. Many users says, Fin and Minox combo works pretty well, But according to my experience, Finasteride helps to stop Hairloss and Minoxidil helps to thicken your follicle
I really have no idea about Alpecian, but I am pretty sure its not FDA approved drug
As, you are young and have decent hair( Not complete slick bald) medicines may work, give a try, alt east it will help to stabilized your loss or prevent it from losing any further..