Formulation code

% Yield  ±  SD

% Drug Entrapped

%  Buoyancy at 12 h ± SD

M41

97.40

83.8 %

72.2 ± 2.687

M42

84.85

84.7 %

73.8 ± 3.253

M43

87.16

82.6 %

68.6 ± 2.121

M151

77.14

82.9 %

62.7 ± 0.849

M152

75.15

81.3 %

61.8 ± 1.273

M153

73.59

80.6 %

63.6 ± 0.636

M1001

44.93

75.6 %

47.0 ±  1.344

M1002

55.6

77.8 %

50.6 ± 0.849

M1003

68.0

72.9 %

53.9 ± 1.273

*Each observation is the mean ± S.D. of three determinations
Table 3: Characteristics of verapamil hcl floating microspheres.