Validated Stability Indicating RP-HPLC Method for Simultaneous Estimation of Codeine Phosphate and Chlorpheniramine Maleate from Their Combined Liquid Dosage Form

Table 6

Results of precision studies.

Drug	Concentration (𝜇g/mL)	Intraday (𝑛=3)		Interday (𝑛=3)
		Measured concentration (𝜇g/mL); AM ± SD	% CV	Measured concentration (𝜇g/mL); AM ± SD	% CV
CP	100	99.33 ± 0.45	0.45	99 ± 0.45	0.46
CPM	20	19.46 ± 0.12	0.64	19.58 ± 0.1	0.53