Xanax (alprazolam) is a prescription tablet for generalized anxiety disorder and panic disorder. Learn about side effects, dosage, uses, and more. Alprazolam is a benzodiazepine. Benzodiazepines belong to the group of medicines called central nervous system (CNS) depressants, which are medicines that slow down the nervous system. This medicine is available only with your doctor's prescription. This product is available in the following dosage forms: Alprazolam (Xanax, Xanax XR, Niravam) is an anti-anxiety drug that belongs to the benzodiazepine class. Common side effects are fatigue, constipation, changes in weight, and addiction (dependency). Xanax (alprazolam) is a medication that treats anxiety. It calms down your nervous system. Detailed dosage guidelines and administration information for Xanax (alprazolam). Includes dose adjustments, warnings and precautions. Xanax (Alprazolam) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Xanax (alprazolam) is a benzodiazepine medication used to treat anxiety and panic disorders. Includes side effects, interactions and safety information. Overview: Alprazolam is a benzodiazepine medicine used to treat anxiety and panic disorder. It works by calming activity in the brain, which helps ease worry and promote relaxation. People take. How Xanax affects your body can vary by your age, mental state when you take the drug, dosage, and other factors. It may have a sedative effect that can make you feel calmer. Alprazolam, sold under the brand name Xanax among others, is a fast-acting, potent tranquilizer of moderate duration within the triazolobenzodiazepine group of chemicals called benzodiazepines. [15].