A Simple and Improved HPLC-PDA Method for Simultaneous Estimation of Fexofenadine and Pseudoephedrine in Extended Release Tablets by Response Surface Methodology

Table 8

System suitability study.

Parameter	PSU	FEX	Limit [14–16]
% RSD of	0.592	0.484	% RSD ≤ 2%
% RSD of	0.192	0.211	% RSD ≤ 2%
Tailing factor ()	1.626	1.150	USP ≤ 2.0
Resolution ()	—	10.94	≥ 2.0
	0.018 μg/mL	0.013 μg/mL	= 3 : 1
	0.055 μg/mL	0.041 μg/mL	= 10 : 1

. on visual detection.