| Side Effects | 
        Group I | 
        Group II | 
        Group III | 
       
      
        | (n=90) | 
        No. | 
        % | 
        No. | 
        % | 
        No. | 
        % | 
       
      
        | Nausea | 
        7 | 
        23.33 | 
        2 | 
        6.67 | 
        1 | 
        3.33 | 
       
      
        | Hypotension* | 
        20 | 
        66.67 | 
        12 | 
        40 | 
        5 | 
        16.67 | 
       
      
        | Bradycardia** | 
        4 | 
        13.33 | 
        1 | 
        3.33 | 
        1 | 
        3.33 | 
       
      
        | Itching** | 
        - | 
        - | 
        1 | 
        3.33 | 
        2 | 
        6.67 | 
       
      
        | Headache* | 
        5 | 
        16.67 | 
        3 | 
        10 | 
        1 | 
        3.33 | 
       
      
        | Shivering | 
        5 | 
        16.67 | 
        2 | 
        6.67 | 
        1 | 
        3.33 | 
       
     
    *P<0.01 **P<0.001 |