Spectrophotometric Simultaneous Determination of Salbutamol Sulfate and Ketotifen Fumarate in Combined Tablet Dosage Form by First-Order Derivative Spectroscopy Method

Table 3

Intraday and interday precision data of salbutamol sulfate and ketotifen fumarate for proposed method.

Sr. no.	Concentration (µg/mL)	Salbutamol sulfate		Ketotifen fumarate
		Absorbance	%RSD	Absorbance	%RSD
Intraday
1	10	0.00227	0.91	0.01004	0.15
2	20	0.00443	0.93	0.02063	0.12
3	30	0.00672	0.37	0.03128	0.05
Interday
1	10	0.00230	1.02	0.01010	0.20
2	20	0.00445	0.88	0.02059	0.34
3	30	0.00670	0.43	0.03130	0.17