Does deprenyl help with depression?

Yes: Called a monoamine oxidase inhibitor (maoi), it increases levels of serotonin, norepinephrine, and Dopamine in your brain. Although very effective ( better than ssris), maois are not commonly used for depression due to the dietary restrictions (can't eat anything with tyramine - beer, aged cheese, etc). Selegiline comes in a patch version called emsam, which lessens the restriction.

Yes it can: There are many articles and case reports of this medication being used to treat depression, and not just in parkinson's patients. www.drugs.com/dosage/selegiline.html detailed selegiline dosage information for adults. Includes dosages for depression and parkinson's disease; plus renal, liver and dialysis adjustments.