Modification of concomitant drug release from oil vehicles using drug-prodrug combinations to achieve sustained balanced analgesia after joint installation

TY - JOUR

T1 - Modification of concomitant drug release from oil vehicles using drug-prodrug combinations to achieve sustained balanced analgesia after joint installation

AU - Thing, Mette

AU - Jensen, Sabrine Smedegaard

AU - Larsen, Claus Selch

AU - Ostergaard, Jesper

AU - Larsen, Susan Weng

N1 - Copyright © 2012 Elsevier B.V. All rights reserved.

PY - 2012/12/15

Y1 - 2012/12/15

N2 - Intra-articular injection of two drugs in a sustained drug delivery system combining the use of lipophilic solution with the prodrug approach may provide efficient and prolonged postoperative pain treatment after arthroscopic procedures. In the present study, the concomitant release of N,N-diethyl glycolamide ester of naproxen and ropivacaine from an oil vehicle consisting of medium-chain triglycerides were investigated in vitro. The release into both phosphate buffer and 80% (v/v) synovial fluid at pH 7.4 was examined in two dialysis membrane-based release models. The ester prodrug exhibited high solubility in medium-chain triglyceride, a high partition coefficient and was rapidly converted to naproxen in synovial fluid. Compared to naproxen, the release of the prodrug from the oil was sustained. In synovial fluid, the reconversion to naproxen resulted in faster release compared to that observed using buffer. In both release models, the use of ropivacaine-prodrug combination provided concomitant release from the oil into synovial fluid with ropivacaine being released faster than naproxen. The use of lipophilic prodrugs that are converted fast to the parent drug in synovial fluid seems to be a feasible approach to obtain prolonged joint residence time.

AB - Intra-articular injection of two drugs in a sustained drug delivery system combining the use of lipophilic solution with the prodrug approach may provide efficient and prolonged postoperative pain treatment after arthroscopic procedures. In the present study, the concomitant release of N,N-diethyl glycolamide ester of naproxen and ropivacaine from an oil vehicle consisting of medium-chain triglycerides were investigated in vitro. The release into both phosphate buffer and 80% (v/v) synovial fluid at pH 7.4 was examined in two dialysis membrane-based release models. The ester prodrug exhibited high solubility in medium-chain triglyceride, a high partition coefficient and was rapidly converted to naproxen in synovial fluid. Compared to naproxen, the release of the prodrug from the oil was sustained. In synovial fluid, the reconversion to naproxen resulted in faster release compared to that observed using buffer. In both release models, the use of ropivacaine-prodrug combination provided concomitant release from the oil into synovial fluid with ropivacaine being released faster than naproxen. The use of lipophilic prodrugs that are converted fast to the parent drug in synovial fluid seems to be a feasible approach to obtain prolonged joint residence time.

U2 - 10.1016/j.ijpharm.2012.09.033

DO - 10.1016/j.ijpharm.2012.09.033

M3 - Journal article

C2 - 23010284

SN - 0378-5173

VL - 439

SP - 246

EP - 253

JO - International Journal of Pharmaceutics

JF - International Journal of Pharmaceutics

IS - 1-2

ER -