The i.v. administration of drugs.
D000368:Aged; D015760:Alfentanil; D000700:Analgesics / Q000378:metabolism; D005283:Fentanyl / Q000031:analogs & derivatives / Q000378:metabolism; D006801:Humans; D007263:Infusions, Parenteral; D007275:Injections, Intravenous; D007700:Kinetics; D008954:Models, Biological; D004364:Pharmaceutical Preparations / Q000008:administration & dosage* / Q000378:metabolism
D000700:Analgesics; D004364:Pharmaceutical Preparations; D015760:Alfentanil; D005283:Fentanyl