Tretinoin DexpanthenolGel (50mg 2,500mg/100g) 1.Formulation I.Tretinoin(BASF)...................................50.0mg LutrolE400[1].........................................5.0g CremophorRH40[1]...............................6.0g Butylhydroyto luene.................................40mg
II.Water.....................................................68.4g Dexpanthenol(BASF)................................2.5g III.LutrolF127[1].......................................18.0g 2.Manufacturing AddIIslowlyto theclearsolutionIatabout40C.Heatto about50C anddissolveabout4gofIIIinI/
II.Coolto about6Canddissolvethe resto fIII.Maintaincooluntiltheairbubblesescaped. 3.Propertiesofthegel Aclearyellowishgelwasobtained. 4.Chemicalstability(12months,23C,dark) Tretinoin96% Dexpanthenol100% 5.Remark Itisimportantto protectthegelagainstlightto avoidtheisomerization anddegradationoftretinoin.
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