title: Sparingly-soluble narcotic zinc tannates cause protracted analgesia in rats.
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage*; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D003692:Delayed-Action Preparations; D003932:Heroin / Q000494:pharmacology; D047348:Hydrolyzable Tannins; D004091:Hydromorphone / Q000494:pharmacology; D008297:Male; D010146:Pain / Q000503:physiopathology; D051381:Rats; D012995:Solubility; D013997:Time Factors; D015032:Zinc
chemical_list: D000701:Analgesics, Opioid; D003692:Delayed-Action Preparations; D047348:Hydrolyzable Tannins; D003932:Heroin; D015032:Zinc; D004091:Hydromorphone