Development and Validation of First-Order Derivative Spectrophotometry for Simultaneous Determination of Levocetirizine Dihydrochloride and Phenylephrine Hydrochloride in Pharmaceutical Dosage Form

Table 5

Precision data at 283.2 nm for PHE.

Conc.; (μg/mL)	Intraday; Mean ± S.D. (𝑛=3)	% RSD	Interday; Mean ± S.D. (𝑛=3)	% RSD
24	0.153±0.001	0.99	0.156±0.002	1.60
32	0.192±0.001	0.79	0.197±0.002	1.01
40	0.225±0.002	1.11	0.226±0.003	1.55