[Influence of spasmolytic agents on the cumulative calcium dose-effect curve in isolation-perfused peripheral...

The influence of verapamil, theophylline, and papaverine on the cumulative calcium dose-effect curve was studied at the isolated perfused rat tail. The results indicate different changes of the contraction and relexation phase respectively. The findings are discussed in connection with the action mechanism of the drugs and the processes of excitation-contraction coupling.