how was cyproheptadine found to help with appetite?
 Cyproheptadine is an antihistamine. However, the drug also works as an appetite stimulant in felines. That's because it has an anti-serotonin effect. Decreased serotonin levels in Fluffy's brain give him the desire to eat. If your cat's suffering from cancer and going through chemotherapy, eating becomes a chore. Just when he needs his strength the most, he has no interest in food. Cyproheptadine can help him, and you, get through this difficult period. 