Alprazolam: general

Alprazolam is a benzodiazepine [1], specifically the first triazolobenzodiazepine marketed in the US and Canada [2]. It's a GABA agonist with anxiolytic, anticonvulsant, sedative, and muscle relaxant effects [3], working by decreasing abnormal excitement in the brain [1]. It's approved for anxiety and panic disorders [4][2], and it's the most commonly prescribed psychotropic medication in the US [4], reported to be fast-acting and potent, with moderate duration [5].

The two things that matter most before anything else:

Depressants as a class slow central nervous system activity — breathing and heart rate slow down — and can cause drowsiness and, at high doses, unconsciousness [6]. As with benzodiazepines generally, combining with other sedating drugs, especially opioids, substantially increases the risk of accidental overdose and fatal respiratory depression [7]. Don't mix.

In one Toronto sample from July 2021, 70% of expected fentanyl samples tested positive for at least one nonmedical benzodiazepine [8]. Test strips aren't fully reliable either: as with benzodiazepines generally, they can miss related compounds like etizolam 50-70% of the time due to poor water solubility [8]. That means a negative test doesn't rule out a benzodiazepine being present.

If you're taking alprazolam outside medical supervision, the standard precautions apply: pace yourself until you know what you've got, don't mix drugs, don't use alone, and have someone around who can respond if things go wrong [9].

References

1. Alprazolam: MedlinePlus Drug Information — MedlinePlus, National Library of Medicine
2. Alprazolam: pharmacokinetics, clinical efficacy, and mechanism of action — PubMed (Journal article)
3. Alprazolam | C17H13ClN4 | CID 2118 — PubChem, National Institutes of Health
4. Alprazolam - StatPearls — NCBI Bookshelf, National Institutes of Health
5. Alprazolam — Wikipedia
6. Depressants — Australian Drug Foundation (ADF)
7. Anxiolytics and Sedative-Hypnotics Toxicity - StatPearls — NCBI Bookshelf (US National Library of Medicine)
8. Risks and Harms Associated with the Nonmedical Use of Benzodiazepines in the Unregulated Drug Supply in Canada — Canadian Centre on Substance Use and Addiction (CCSA)
9. Safer-use Strategies: Downers/Depressants — University of Washington HARRT Lab