Phentermine Weight Loss (2026): Complete Guide by Dr. Sofia Miller, BPharm (Hons), MClinSci Medically Reviewed | Updated 2026 | For Australian AudienceEducational information only – not medical advice What Is Phentermine? Phentermine is a prescription-only appetite suppressant designed to help with short-term weight loss. It belongs to a group of drugs known as sympathomimetic amines,…