Simultaneous Estimation of Paracetamol, Ambroxol Hydrochloride, Levocetirizine Dihydrochloride, and Phenylephrine Hydrochloride in Combined Tablet Formulation by First-Order Derivative Spectrophotometry

Table 5

Assay results of marketed formulation.

Parameters	PARA	AMB	LEVO	PHEN
Actual concentration (μg/mL)	60	12	12	12
Percentage purity	99.62	101.02	100.98	99.66
% RSD	0.1661	1.9231	1.6141	1.1750