Degradation of E-type prostaglandin compounds is retarded by dissolving or suspending such compounds in formulations containing hydroxylated derivatives of fatty acids having the formula: IMAGE wherein R1 is C2-C24 alkyl, R2 is C2-C24 alkyl and n is an integer from 1-6, denoting from 1 to 6 hydroxyl groups which may be substituted in R1 or R2.
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