Proscalpin is categorized as a type II reductase inhibitor. This means that this drug inhibits the functioning of 5-alpha reductase. This is an enzyme that is necessary for to be transformed into in the scalp, which is a hormone variation that has been identified as responsible for follicle death and the loss of hair. Through the inhibition of the conversion process, Proscalpin lowers the levels of DHT and slows down the hair loss process.