Liquid Chromatography-Tandem Mass Spectrometry Method for the Determination of Vardenafil and Its Application of Bioequivalence

Table 1

Gradient settings of mobile phase for vardenafil hydrochloride trihydrate assay.

Time (min)	Percentage of mobile phase in eluent
	A	B
0.0	90	10
0.5	10	90
3.0	90	10
6.0	90	10

A: 0.1% (v/v) formic acid in water; B: acetonitrile.