1. The significance of studying vasoconstrictor activity of topical corticosteroids was summed up.
2. Forty eight test samples which contained amcinonide, betamethasone 17-valerate and triamcinolone acetonide in the concentration of 2
-2 to 2
-14 times the commercially available ones were prepared in each vehicle of o/w cream and petrolatum of the three. The test materials were applied at random with the closed patch method, to the upper back of 24 healthy male volunteers for 4 hours. The vasoconstriction reading was performed at 2, 5, 20 and 24 hours after removal of the test material. The key-code was opened at the time of analysis, after the completion of the study, by the evaluator, the author of this paper.
3. The positive frequency and the degree of blanching phenomenon at each concentration of the three topical corticosteroids, were compared. Also, the ED
50 values were calculated. The results revealed that there was little difference in the vasoconstrictor activity among amcinonide, betamethasone 17-valerate and triamcinolone acetonide, when o/w type cream was used as a vehicle. On the contrary, in the ointment bases, amcinonide was significantly superior to betamethasone 17-valerate and triamcinolone acetonide in the vasoconstrictor activity.
4. Judging from the ED
50 values, the release of betamethasone 17-valerate and triamcinolone acetonide from each cream base was apparently superior to that from petrolatum. No definite difference in the release of amcinonide between cream and ointment base was observed.
5. Redness occurred in one of the 24 cases, at the sites of application with amcinonide cream and triamcinolone acetonide cream, also, in another case with amcinonide ointment and triamcinolone acetonide ointment. The reaction disappeared rapidly after the removal of test material and seemed to be slight irritation due to some ingredients of vehicles.
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