[Our experience with the method of D'Amour and Smith]

The authors carried out studies on a group of analgetic preparations (morphine, lydol, thylidine, pentazocine and analgine) by the method of D Amour and Smith, using thermic painful stimulation. The experiments were carried out on white rats-young and adult of both sexes of the strain Wistar. The mean lethal dosis were determined as well as the mean effective doses and therapeutic indices. The experimental results showed that thylidine was the strongest analgetic agent with atherapeutic index of 67. The index of morphine was 63 and was close to that of thylidine, but without statistical significance. The remaining analgetic indices were with low indices: lyndiol-with 5, pentazocine - 12 and analgine - 2. The method used, according to our data, could be applied successfully on rats of both sexes, at various age groups and both strains. The method is convenient for testing analgetic activity of preparations from two basic types of analgetic agents-narcotic and nonnarcotic.