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TretinoinGel (50mg/100g) 1.Formulation I.Tretinoin(BASF)......................................0.05g Ethanol.................................................15.0g CremophorRH40[1]...............................1.0g Perfume.....................................................q.s. Butylhydroxyto luene...............................0.04g II.Carbopol940(Goodrich)..........................0.5g Water.....................................................76.0g III.Triethanolamine........................................0.7g Water.......................................................6.6g 2.Manufacturing PreparesuspensionIIandaddsolutionIIIto thewellstirredsuspension. WhenaclearmixtureisformedaddsolutionI. 3.Properties Aclearyellowishgelwasobtained. 4.Chemicalstability(20–25C,dark) Nolossoftretinoinwasmeasuredafter1year. 5.Remark Itisimportantto protectthegelagainstlightto avoidtheisomerization anddegradationoftretinoin.
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