Dual Wavelength Spectrophotometric Method for Simultaneous Estimation of Atorvastatin Calcium and Felodipine from Tablet Dosage Form

Table 4

Result of recovery studies and interday precision.

Day	Label claim (mg/tablet)	Amount added (%)	Total amount added (mg)	Concentration recovered* (mean ± SD)	% recovery estimated* (mean ± %SD)
Day 1	ATR 10	80	8	8.02 ± 0.34	100.22 ± 1.12
		100	10	10.90 ± 0.78	98.10 ± 0.98
		120	12	12.23 ± 0.89	103.91 ± 1.23
	FEL 10	80	8	8.17 ± 1.45	101.70 ± 1.18
		100	10	10.71 ± 1.78	101.68 ± 1.24
		120	12	12.99 ± 1.25	99.93 ± 0.98
Day 2	ATR 10	80	8	8.04 ± 1.11	101.11 ± 1.25
		100	10	10.08 ± 1.45	101.60 ± 1.17
		120	12	12.03 ± 0.34	100.64 ± 1.11
	FEL 10	80	8	8.17 ± 1.71	101.70 ± 0.65
		100	10	10.22 ± 1.12	97.76 ± 0.34
		120	12	12.54 ± 0.34	103.60 ± 0.32

*Indicates ± SD ().