quad bars are a common slang for
xanax 2mg tablets, which are bar shaped and can be broken into 4 .5mg doses. So there is no difference, quad bars are xanax. Xanax is a brand name for a drug called
alprazolam. It is in a class of drugs called benzodiazapines, which also include
Valium (diazapam) and
Ativan (lorazopam). All benzodiazapines are CNS sedatives, meaning they act directly on the brain to relax muscles, respiration rate, heart rate and provide an overall feeling of relaxation. Benzodiazapines are prescribed to combat anxiety, insomnia, muscle tension, and involuntary movements like jaw clenching and shaking-leg syndrome. Benzodiazapines are also known to cause antegrade amnesia (short-term memory loss) at moderate to high doses. For this reason they are often used as an adujenct a to pre-surgery anesthesia to avoid remembering the procedure. Benzodiazapines are popular among some recreational drug users who find the sedating and relaxing effects enjoyable, and often mix them w/ other CNS depressants like alcohol. Xanax is considered to be one of the most desireable benzos for rec use because of it's fast onset and shorter period of action than other benzos. Xanax, like all benzos, is a schedule IV controlled substance in the US, making possession w/o a perscription illegal, and transfer or sale illegal w/o a liscence. I hope this answers your questions.
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quad bars and xanex bars 
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