Written by Jennifer Gershman, PharmD, CPh, PACS | Reviewed by Sarah Gupta, MD Published on July 3, 2023 Key takeaways: Some medical conditions, including cancer, can cause undesired weight loss. Megestrol (Megace ES), dronabinol (Marinol, Syndros), and oxandrolone are FDA-approved appetite stimulants that can promote weight gain and nutritional intake when needed. Mirtazapine (Remeron) is...