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

Table 4

Recovery for vardenafil (standard) and internal standard.

	Standard	Internal standard
Recovery %
LQC	99.81	74.06
MQC	103.84	67.09
HQC	100.39	68.57
Mean	101.4	70.0
SD	2.17	3.67
RSD %	2.14	5.25

SD: standard deviation; RSD: relative standard deviation; %: percentage; LQC: low quality control; MQC: medium quality control; HQC: high quality control; n = 3.