title: Inclusion complex of piroxicam with beta-cyclodextrin and incorporation in cationic microemulsion. In vitro drug release and in vivo topical anti-inflammatory effect.
abstract: Topical formulations of piroxicam were evaluated by determination of their in vitro release and in vivo anti-inflammatory effect. The in vitro release assay demonstrated that the microemulsion (ME) systems provided a reservoir effect for piroxicam release. However, the incorporation of the ME into carboxyvinilic gel provoked a greater reduction in the release of piroxicam than the ME system alone. Anti-inflammatory activity was carried out by the cotton pellet granuloma inhibition bioassay. Topical anti-inflammatory effect of the piroxicam inclusion complex/ME contained in carboxyvinilic gel showed significant inhibition of the inflammation process (36.9%, P<0.05). Subcutaneous administration of the drug formulations showed a significant effect on the inhibition of inflammation, 68.8 and 70.5%, P<0.05, when the piroxicam was incorporated in ME and in the combined system beta-cyclodextrin (beta-CD)/ME, respectively, relative to the buffered piroxicam (42.2%). These results demonstrated that the ME induced prolonged effects, providing inhibition of the inflammation for 9 days after a single dose administration.
authors.affiliation: Departamento de Farmácia Industrial, Centro de Ciências da Saúde, UFSM, Campus Universitário, Camobi, 97.119.900, RS, Santa Maria, Brazil.
authors.forename: M E
authors.initials: ME
authors.lastname: Dalmora
authors.forename: S L
authors.initials: SL
authors.lastname: Dalmora
authors.forename: A G
authors.initials: AG
authors.lastname: Oliveira
mesh_terms: D000287:Administration, Topical; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000493:pharmacokinetics* / Q000494:pharmacology; D002626:Chemistry, Pharmaceutical; D003505:Cyclodextrins; D004655:Emulsions; D007279:Injections, Subcutaneous; D010894:Piroxicam / Q000493:pharmacokinetics* / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D047392:beta-Cyclodextrins
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D003505:Cyclodextrins; D004655:Emulsions; D047392:beta-Cyclodextrins; D010894:Piroxicam; C031215:betadex