Blondes can lose 80% of their hair without detecting it readily. The best way to determine how much hair you are actually losing is to get a HAIRCHECK test and then you will know exactly where you stand. You may be losing more hair than you are seeing. For finasteride, only 2-4% of people get sexual side effects, so starting at the regular dose is okay. If you only takeĀ half the dose, it will be 80% as effective with some people reporting less sexual side effects.