Deprenyl is a drug that is used to treat Parkinson's disease. Its anti-aging benefits include improved memory, slowing of the loss of sexual capacity and increased lifespan.
Deprenyl is sold in the U.S. for treatment of Parkinson's disease under the name Eldepryl and is fairly expensive. It does require a prescription.
Standard dosage for humans is 10mg/day.
Side-effects can include nausea, stomach ache, drowsiness and depression. High dosages can result in sudden high blood pressure and agitation.