Even if you’re prescribed by a doctor to take Xanax, some negative side effects may occur with the use of this drug. Physical symptoms may include dizziness, nausea, blurred vision, dry mouth, sluggishness, and lack of coordination. These common side effects aren’t necessarily always signs of abuse, rather they may occur with any use of this drug. Regardless of the reason, someone takes Xanax, the effects usually start to occur within about an hour and last for around six hours in total. The more Xanax a person takes, the more likely they are to experience the following signs of abuse. Common signs of Xanax addiction that are visible to observers include trouble with cognition and also trouble forming words properly. A lot of times people who are on Xanax will sound similar to someone who is intoxicated from alcohol because of slurring.