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Alprazolam

Group: Depressants
Nicknames: Xanax, Xans, Xannies, Bars, Handle bars, Zanies, Rlam, Devils, Hulks
Last reviewed: October 2026

Pharmacology

Alprazolam is a GABA-A receptor positive allosteric modulator. This means that alprazolam increases the effects of GABA, our brain’s main inhibitory neurotransmitter which turns down nerve signals, thereby calming the brain and subsequently the mind. 

Alprazolam has a high oral bioavailability of 80–90%, meaning it is efficiently absorbed when taken by mouth. Following oral administration, alprazolam is quickly absorbed and metabolised by the body. Peak concentrations in blood plasma (proportionate to the dose) occur approximately 1–2 hours after ingestion. Immediate release alprazolam has a duration of around 6 hours. 

Alprazolam is metabolised in the liver by the CYP3A4 enzyme. It is advised not to take alprazolam alongside eating/drinking grapefruit or other CYP3A4 inhibitors (e.g. combined contraceptive pill, some SSRIs, antifungals, and antiretrovirals) when taking alprazolam. Alprazolam and its metabolites are mainly removed from the body in urine by the kidneys, with 50% removed within 11–16 hours, depending on formulation and individual variations.

When alprazolam is taken long term, the brain’s GABA receptors become desensitised, requiring higher doses for the same effect. It is advised that people taking alprazolam long term do not stop suddenly using (quitting cold-turkey). Desensitised GABA receptors take a while to get back to baseline, meaning they will be unable to keep nerve signals in check without alprazolam which may lead to dangerous withdrawal symptoms such as seizures. Instead, it is advised to gradually taper the dose down under medical supervision.

As alprazolam turns down brain signals, combining the drug with other depressant drugs increases the risk of overdose. Drinking alcohol alongside alprazolam can cause severe sedation, intoxication and blackouts. In combination with opioids, alprazolam can slow down breathing to dangerous, potentially fatal, levels.

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