FORMULATION DEVELOPMENT OF SUSTAINED RELEASE EPIDURAL INJECTION OF ANALGESIC DRUG
The objective of this work was to formulate and evaluate sustained release epidural injection of analgesic drug diclofenac sodium used in chronic lower back pain. The formulation composed of a thermosensitive polymer Pluronic F127 (20%) and sustained release copolymers HPMC K100M (1%) and HPMC K4M (0.5%) optimized using 32 factorial design. The formulation was found to be clear, colorless, sterile, syringeable through 18gauge, forming a stable gel at 37°C with a gel strength of 9.67g/cm. The drug release was found to be 98.13% in 72 hrs. The formulation was found to be stable at refrigerator temperature of 5°C for a month. Thus, a stable parenteral formulation was developed that can be an appropriate and convenient approach for patients requiring frequent parenteral administration, reducing recurrence of dosage and ultimately expanding patient comfort and satisfaction in case of chronic ailments.
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