Some common side effects of Xanax (alprazolam) are as follows:
Depression, Sleepiness and drowsiness, Jerky, uncoordinated movements, Inability to remember bits of information, Slurred speech, Dizziness, light-headedness, Headaches, Constipation, Dry mouth, Tiredness, Irritability, Loss of appetite, Confusion and disorientation, Nervousness or feeling anxious or agitated, Insomnia (lack of sleep), ataxia, Loss of alertness or concentration, Shakiness or trembling, Double or blurred vision, Feeling sick, Skin reactions etc.