Xanax bars are a form of the prescription drug alprazolam, which is a benzodiazepine used to treat anxiety disorders. They are small, pill-sized tablets that can be broken down into quarters and taken individually. Xanax bars are usually 2mg in strength, which is four times the amount of a typical Xanax tablet. They are often referred to as "bars" because of their long, thin shape, which resembles a small candy bar. Xanax bars can come in different colors, such as white, purple, green, and pink, depending on the manufacturer.

Xanax bars are often abused by people who take them without a prescription or take too many. They can create a feeling of relaxation and sedation, which is why they are sought after by those who abuse the drug. Some common slang terms for Xanax bars include "zanies," "planks," and "school buses".

Abusing Xanax bars can lead to a Xanax dependence disorder, and regular use can cause a person to develop a tolerance to the effects of the drug, requiring more Xanax to achieve the same effect. Xanax bars can also create immediate problems for the user, such as tremors and seizures. When mixed with alcohol and other drugs, the effects of Xanax are intensified, and the result can be a fatal overdose.

In summary, Xanax bars are a form of the prescription drug alprazolam that are often abused by people who take them without a prescription or take too many. They can create a feeling of relaxation and sedation, but abusing them can lead to a Xanax dependence disorder and immediate problems such as tremors and seizures.