Table 3

The measured concentration of nifedipine in nifedipine–Methylcellulose 1%/Syrup NF suspension mixed by inverting the bottle three times initially and after 1 week of storage, the deviation from the theoretical concentration (1 mg/ml) and the calculated acceptance value

	Initial1		1 Week*		Initial2		1 Week
Sample	Conc (mg/ml)	Deviation (%)	Conc (mg/ml)	Deviation (%)	Conc (mg/ml)	Deviation (%)	Conc (mg/ml)	Deviation (%)
1	0.95	−4.87	0.26	−73.56	0.65	−35.03	0.29	−71.44
2	0.94	−5.99	0.25	−74.88	0.65	−35.38	0.29	−70.98
3	0.96	−3.65	0.25	−74.84	0.64	−35.97	0.29	−70.99
4	0.93	−7.23	0.25	−75.12	0.64	−36.21	0.28	−71.52
5	0.95	−4.85	0.25	−74.63	0.67	−33.25	0.29	−71.49
6	0.95	−4.69	0.28	−72.48	0.68	−32.12	0.29	−71.48
7	0.99	−1.37	0.27	−72.50	0.82	−18.16	0.28	−71.53
8	0.98	−2.03	0.28	−71.83	1.02	1.94	0.28	−72.19
9	0.99	−0.60	0.33	−67.11	1.17	16.51	0.29	−71.33
10	0.95	−5.01	0.38	−62.24	1.14	13.78	0.29	−71.17
Mean conc. (mg/ml)	0.96		0.28		0.81		0.29
SEM	0.01		0.01		0.07		0.00
Mean (%)	95.97		28.08		80.61		28.59
AV	2.58		70.52		18.41		69.92

*If the AV was over 15.0 that suspension lot was discarded and a new sample bottle (Initial 2) was tested.AV, acceptance value; Conc, concentration.