Betahistine dihydrochloride
Etilefrine hydrochloride
Betaserc Tablet
Effortil Tablet
Claimed
amount
(μg/ml )
Authentic
Added
(μg/ml )
Recovery
%
Claimed  
amount (μg/ml)
Authentic 
Added (μg/ml )
Recovery
%
0.25
---
0.5
1
2
3
5
6
100.93
99.07
99.07
100.47
100.62
99.07
100.47
3
---
3
5
7
9
11
13
98.56
100.00
100.87
100.00
99.52
99.61
101.00

Mean*               99.79 
N                       6
S.D.                   0.798
R.S.D.                0.799
V                       0.637
S.E.                   0.326
100.17
6
0.631
0.629
0.398
0.257
*Mean of three different experiments
Table 8: Application of standard addition technique for the determination of betahistine dihydrochloride and etilefrine hydrochloride using fixed time method.