FTU is a measure of:: (A) Area involved in severe drug reactions, (B) Amount of topical drug to be applied, (C) Mucosal involvement in pemphigus, (D) Concentration of drug in topical preparations
Answer is B. An approximate practical measure of topical medication is the fingeip unit, the quantity of ointment, extruded from a tube with a nozzle of 5 mm diameter extending from the distal crease of the forefinger to ventral aspect of the fingeip. This unit weighs approximately 0.49 g in males and 0.43 g in females and covers, on average, an area of approx 300 cm2.