The FDA (U.S. Food & Drug Administration) has approved this drug for use in humans, but it is not officially approved for use in animals. Mirtazapine is an antidepressant used to treat moderate to severe depression in humans. In dogs and cats, mirtazapine can be useful as an appetite stimulant and to prevent vomiting and motion sickness. The FDA allows veterinarians to prescribe products containing this drug in different species or for other conditions in certain situations. **We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.**