Halcion and Xanax are both part of a class of drugs known as benzodiazepines. Both drugs work by increasing the activity of a chemical called GABA in the brain, which has a calming effect. Halcion is generally considered to be more potent than Xanax, and it also has a shorter half-life, which means that it does not stay in the body for as long. As a result, Halcion is generally only prescribed for short-term use, while Xanax can be used for both short and long-term treatment. There are some potential side effects associated with both drugs, including drowsiness, dizziness, and impaired coordination. However, these side effects are typically mild and go away on their own after a few days of treatment.