Xanax works by decreasing abnormal excitement in the brain. It works on the brain and CNS ( Central Nervous System ) to produce a calming effect which in turn slows down the movement of unbalanced brain chemicals resulting in the reduction of anxiety and promoting the effects of some natural chemicals called gamma-aminobutyric acid.
It is an example of ER medicine whose effects last more than that of immediate release i.e. it lasts up to more than 12 hours and it starts working after some while of taking it.
The side effects are the same as that of the IR Xanax tablets. The side effects are tiredness, drowsiness, slurred speech, lack of balance, memory problems, feeling anxious, shallow breathing, lightheadedness, seizure, risk-taking behaviour, increased energy, agitation, double vision, jaundice, sleeplessness, racing thoughts, depressed mood, confusion, hostility, hallucinations and tremor.