Water or alcoholic lotion containing a dissolved powder. Classification of topical formulations Solution Manufacturers interpret the definitions in various ways so a similar preparation might be called lotion, gel or cream. The table below describes different formulations. The vehicle usually contains water, oil, alcohol or propylene glycol mixed with preservatives, emulsifiers, absorption promoters and fragrances. Topical formulations contain an active ingredient, often a medication or drug or botanical, and a vehicle. It takes 20–30 g of cream or ointment to cover an adult's total body once. One fingertip unit covers one side of 2 flat hands, and one gram covers both sides of the patient’s two hands. The fingertip unit (0.5 g) is a guide to the amount of a cream or ointment needed to treat an area for a certain time. It depends on:Įxpect 1 g of cream to spread out over a 10-cm 2 area of skin an ointment spreads a little further. How much topical medication to prescribe can challenge the most experienced dermatologist. Minor differences in the formulation may make surprising differences to the effectiveness of a topical medication.
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