Table II.

Swelling Study

Formulation	Time (h)	Initial W t (W 0) (mg)	Final W t (W t) (mg)	Water uptake
Preliminary formulations
II (HPMC K4 M 30%)	2	204	403	97.54
	4	201	561	178.910
	6	196	689	251.53
	8	298	791	299.49
III (HPMC K4 M 40%)	2	201	536	166.66
	4	193	666	245.07
	6	198	805	306.56
	8	196	912	365.30
X (XG 30%)	2	205	519	188.29
	4	193	678	251.29
	6	195	787	303.54
	8	199	865	334.67
XI (XG 40%)	2	196	598	205.10
	4	198	752	279.79
	6	205	834	306.82
	8	201	901	348.25
XII (XG 50%)	2	201	659	227.86
	4	206	881	327.66
	6	199	1,051	428.14
	8	201	1,189	491.54
Formulations of floating tablets
F I	2	305	819	168.52
	4	291	752	293.12
	6	293	823	348.80
	8	294	901	413.60
F II	2	295	838	184.06
	4	291	1,126	286.94
	6	299	1,288	330.76
	8	295	1,478	401.00
F III	2	289	811	180.62
	4	299	1,094	265.88
	6	304	1,259	314.14
	8	297	1,426	380.13
F IV	2	294	804	173.46
	4	293	1,096	274.06
	6	299	1,303	357.78
	8	302	1,491	393.70
F V	2	299	817	173.24
	4	295	1,119	270.32
	6	295	1,305	343.37
	8	298	1,489	399.66

n = 3

HPMC hydroxypropyl methyl cellulose, F formulation