title: Letters.
mesh_terms: D000280:Administration, Inhalation; D000328:Adult; D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000009:adverse effects*; D003128:Coma / Q000139:chemically induced / Q000188:drug therapy; D004349:Drug Packaging; D005283:Fentanyl / Q000008:administration & dosage / Q000009:adverse effects*; D006801:Humans; D008297:Male; D009270:Naloxone / Q000627:therapeutic use; D009292:Narcotic Antagonists / Q000627:therapeutic use; D009293:Opioid-Related Disorders / Q000188:drug therapy / Q000209:etiology*; D011014:Pneumonia / Q000139:chemically induced* / Q000175:diagnosis / Q000188:drug therapy; D012121:Respiration, Artificial
chemical_list: D000701:Analgesics, Opioid; D009292:Narcotic Antagonists; D009270:Naloxone; D005283:Fentanyl