Yellow Xanax Bars R039 is the imprint code seen on some yellow, rectangular alprazolam tablets originally manufacture as a generic form of Xanax (alprazolam). The tablet is a 2 mg benzodiazepine and is designed to be split into four 0.5 mg doses so don

•These yellow bars are sometimes nickname “yellow school bus” Xanax because of their shape and colour.

•Alprazolam belongs to the benzodiazepine class of drugs that slow central nervous system activity to relieve anxiety and panic symptoms.

A 2 mg benzodiazepine tablet is considered a high-dose format and should only be used if prescribed and monitored by a healthcare professional.

MOST OF Yellow Xanax Bars R039  seen outside of legitimate pharmacy dispensing are counterfeit — meaning they may contain:

•Little or no alprazolam

•Other benzodiazepines (often more potent or different)

•Dangerous substances like fentanyl or flualprazolam

•Random fillers with no predictable effect

Law enforcement and public health reports have found fake yellow Xanax bars containing novel benzodiazepines such as flualprazolam in some jurisdictions — which can be unpredictable and more dangerous than typical alprazolam.

Appearance alone isn’t reliable

Even pills that look like the real R039 bar (same shape and imprint) can be fake. Many counterfeiters make them look very close to authentic ones to deceive buyer

•Dependence and addiction: Benzodiazepines like alprazolam carry a significant risk of physical and psychological dependence, especially at higher doses or with long-term use.

•Overdose risk: Combining benzodiazepines with alcohol, opioids, or other depressants can dangerously slow breathing and be life-threatening.

•Illicit pill hazards: Fake pills may include unexpect substances that can drastically increase overdose risk or produce harmful reactions.

 How to Know if a Pill Is Real

The only safe way to verify a pill’s contents is through laboratory testing (e.g., fentanyl test strips or formal drug checking), not by appearance, colour, or whereby you got it. Many pharmacies and harm reduction programs offer testing services.

If you’re unsure about a medication you possess, don’t take it without confirmation from a pharmacist or other qualified professional.

 Summary

•A yellow Xanax bar with imprint R039 is recognise as a 2 mg alprazolam (benzodiazepine) tablet originally tied to a legitimate generic formulation.

•Outside a pharmacy prescription, many pills marketed this way are counterfeits that can contain unknown and potentially dangerous substances.

•Using benzodiazepines without medical supervision carries risks of dependence, overdose, and serious side effects, especially when mixed with other depressants