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2006, Number 1

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Gac Med Mex 2006; 142 (1)

Analysis of the digital unit as reference measurement for the topical prescription in Mexico.

Juan Pablo Castanedo-Cazares, Bertha Torres-Alvarez, Alejandra Martínez-Rodríguez, Adriana Díaz-Rosales, Benjamín Moncada

Language: Spanish
References: 14
Page: 35-38
PDF size: 73.05 Kb.


ABSTRACT

Introduction: Topical prescription unlike other dosage forms is generally considered an inaccurate procedure. The fingertip unit (FTU) is a proposed measure for dosing a topical drug. FTU is the amount of ointment obtained from a tube with a 5 mm diameter nozzle, applied from the distal skin-crease to the tip of the index finger.
Objective: Asses FTU as a reference measure for topical prescription among the Mexican population.
Methods: The length of the II hand fingertip was recorded in 324 individuals and the weight of 1 FTU and its covering surface was registered.
Results: Average length of index fingertip was 24 mm (IC95 26.7-27.2) in males (n=40), and 24 mm (IC95 24.3-24.8) in females (n=50). One FTU weighed 0.45 g (IC95 0.41-0.48) in males (n=40), and 0.38 g (IC95 0.35-0.41) in females (n=50). One FTU covered 275 cm2 (IC95 255-294) in males (n=15), and 257 cm2 (IC95 200-240) in females (n=15).
Conclusion: FTU may be a helpful measure for dosing and supervising the administration of topical medications for both patients and dermatologists in Mexico.


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