My understanding is that benzos are nearly impossible to die from. The amount you have is also actually close to nothing in terms of having serious effects. They could potentiate the effect of heavy-hitters like opioids, but they're mostly used to calm people down and decrease the suffering of effective methods.
From Wong et al., 2015 (J Vet Intern Med):
"Adverse effects of alprazolam administration in people include drowsiness, fatigue, weakness, ataxia, and sedation; however, the medication has a wide safety margin evidenced by the very high
median lethal dose of alprazolam that will kill 50% of rats (LD50, 331–2171 mg/kg).
6,
10 After accidental
ingestion of alprazolam in dogs at doses as high as 5.55 mg/kg, clinical signs were similar to those reported in people and included ataxia and disorientation, depression, hyperactivity, gastrointestinal distress, weakness, tremors, vocalization, increased heart and respiratory rate, hypothermia, and increased salivation developing within 10–30 minutes postingestion.
11 Despite the high doses ingested, death was not reported in any of those dogs, emphasizing the safety of this drug."
So if someone is like 70kg, they'd have to take 23000-151970mg of Xanax and they would still have a 50% chance of survival. Assuming humans would respond similarly to rats, that is. Apparently, the amount you have would be enough to give a chihuahua a rough night, though.
