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Development of a Topical 48-H Release Formulation as an Anti-scarring Treatment for Deep Partial-Thickness Burns.
AAPS PharmSciTech 2018 July
The purpose of this study was to develop pirfenidone (PF) ointment formulations for a dose finding study in the prophylactic treatment of deep partial-thickness burns in a mouse model. A preformulation study was performed to evaluate the solubility of PF in buffers and different solvents and its stability. Three different formulations containing 1, 3.5, and 6.5% w/w PF were prepared and optimized for their composition for testing in mice. Optimized formulations showed promising in vitro release profiles, in which 20-45% of PF was released in the first 7 h and 70-90% released within 48 h. The rheological properties of the ointment remained stable throughout storage at 25 ± 2°C/60% RH. Animal studies showed treatments of burn wounds during the inflammatory stage of wound healing with PF ointments at different drug concentrations had no adverse effects on reepithelization. Moreover, 6.5% PF ointment (F3) reduced the expression of pro-inflammatory cytokines IL-12p70 and TNFα. This study suggests that hydrocarbon base ointment could be a promising dosage form for topical delivery of PF in treatment of deep partial-thickness burns.
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