Simultaneous Estimation of Ibuprofen and Phenylephrine Hydrochloride in Bulk and Combined Dosage Form by First Derivative UV Spectrophotometry Method

Table 3

Robustness (measuring absorbance at different time).

Time	Absorbance		% Result
	IBU	PHE	IBU	PHE
5 min	0.04438	0.00406	100	100
10 min	0.04431	0.00402	99.84	99.01
15 min	0.04429	0.00402	99.79	99.01