All have the same active ingredient: FINASTERIDE
- Brand propecia has 1 mg finasteride
- Generic propecia has 1 mg finasteride but cheaper than the original brand of Merck
- Proscar is 5 mg finasteride, so you cut your pill in 4 parts (5 is almost impossible) and you have 1,25 mg per pill. It is cheaper
The difference between them is the cost. Results are the same