Table 4.

Results of delivered dose uniformity testing for determining Ipratropium and Fenoterol in Atrovent® comp HFA inhaler using the proposed spectrophotometric methods.

Atrovent® comp HFA meter dose no	Label claim (%)
	IPR			FEN
	ICS method	IDW method	IAM method	ICS method	IDW method	IAM method
1	99.99	99.89	100.54	96.88	97.47	100.09
2	103.63	100.26	100.32	98.23	98.44	100.02
3	100.04	98.89	100.97	97.75	102.18	102.23
4	98.37	101.25	100.63	97.26	98.81	100.13
5	102.73	99.52	100.45	98.71	99.03	101.12
6	99.46	103.97	101.44	97.02	103.06	102.31
7	101.32	101.99	95.58	100.16	98.66	95.87
8	103.05	102.26	96.61	99.92	99.42	97.85
9	99.59	103.38	99.94	100.40	100.61	98.53
10	103.05	102.98	102.29	99.92	101.95	101.67
Mean	101.12	101.44	99.90	98.62	99.97	99.98
SD	1.78	1.66	2.0	1.31	1.78	1.95
RSD%	1.76	1.64	2.0	1.33	1.78	1.95
AV *	4.26	3.98	4.87	3.15	4.26	4.69

*Acceptance value = 2.4 × SD with maximum allowed level (L1) is 15.