title: Biodegradable injectable implant systems for long term drug delivery using poly (lactic-co-glycolic) acid copolymers.
abstract: Poly (lactide-co-glycolide) (PLG), is one of the most widely employed biodegradable synthetic polymers for sustained-release preparations. In the present work, PLG (50:50) copolymer has been used to deliver diclofenac sodium in the form of microspheres and in situ gel-forming systems, both of which can be injected subcutaneously. The pharmacodynamic and pharmacokinetic studies in the adjuvant-induced arthritic rats showed that the microspheres offered steady therapeutic levels of the drug in the plasma for about 16 days following a single subcutaneous injection. However, the in situ gel-forming system provided a significantly higher maximum plasma concentration and increased inhibition of inflammation, maintained for about 10 days. Injectable microspheres and in situ gel-forming implant systems of PLG (50:50) copolymer may therefore be considered as prospective implantable controlled-release dosage forms to deliver drugs in long-term therapy of chronic ailments.
authors.affiliation: College of Pharmaceutical Sciences, Kasturba Medical College, Manipal, India.
authors.forename: G
authors.initials: G
authors.lastname: Chandrashekar
authors.forename: N
authors.initials: N
authors.lastname: Udupa
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D019540:Area Under Curve; D001169:Arthritis, Experimental / Q000188:drug therapy; D001672:Biocompatible Materials / Q000008:administration & dosage* / Q000737:chemistry; D004008:Diclofenac / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D016503:Drug Delivery Systems; D006207:Half-Life; D019344:Lactic Acid; D008297:Male; D008863:Microspheres; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000008:administration & dosage* / Q000737:chemistry; D051381:Rats
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001672:Biocompatible Materials; D011108:Polymers; D004008:Diclofenac; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid