Red Xanax bars are potent xanax bars that come with the imprint “R 666” along with the grooves for ease of breakage. These bars also contain 2 and 3mg of the drug’s active ingredient. It effectively manages anxiety, seizures, mild insmonia, and co-morbid depression.rnrnAs a pill, it contains 5mg of Alprazolam, the most potent drug concentration. In addition, the risk of severe side effects increases manifold, and it is important to take it as per your doctor’s instruction. It is also named red devil xanax bar as it has high potency and roughly contains 5 mg of Alprazolam, which can make bloodshot eyes.rnrnOften people are curious to know does xanax make your eyes red. The answer is yes; certain drugs, including antidepressants and Benzodiazepines, can make your eyes look bloodshot due to an overdose. It is also available as a xanax red circle pill and in the form of pills.rnrnThe RED XANAX bar slows the brain’s activity and induces a calming effect on the mind.