Answer :
This is a case of benzodiazepine overdose from Alprazolam (Xanax). Benzodiazepine overdose presents mostly with inhibition of the central nervous system including the brainstem (hence explaining the decreased respiratory rate and somnolence) as well as systemic effects such as decrease in heart rate and in blood pressure. The antidote for benzodiazepine overdose is Flumenazil which is a selective benzodiazepine receptor antagonist and prevent further binding and action of the administrated benzodiazepine.