Caren, I am not on zyprexa but I do think that the lamictal I take makes me lose some hair, or maybe it's the abilify? I don't know. But I do shed like crazy and it clogs my drains.
I have heard that the vitamin "biotin" (I think that's how you spell it?) works well for hair, nails, and even skin. You may want to pick some up at your pharmacy next time you are there. Of course ask the pharmacist if it is ok to take that with your meds.