Ventilatory depression / respiratory arrest amenable to resuscitation measures and the specific antidote naloxone (PMID 26370638) is the most common complication of the substance. Acute, flash pulmonary edema is a classic complication of i.v. heroin. Benzodiazepine and alcohol (ethanol) may be cotoxicants in heroin-associated deaths (PMID 2391481). The development of PAH should raise the suspicion of pill excipient-induced vasculopathy and consequent PHT. Buprenorphine diversion may lead to that complication. Major contribution at PMID 5339228