| Drug | Class | Inotropic activity |
|---|---|---|
| Xamoterol | β Receptor antagonist | Mild |
| Dobutamine | Dopamine, α, and β receptor antagonist | Strong |
| Ibopamine | Dopamine, α, and β receptor antagonist | Weak |
| Amrinone | Phosphodiesterase inhibitor | Strong |
| Enoximone | Phosphodiesterase inhibitor | Strong |
| Flosequinan | Attenuates inositol triphosphate | Weak |
| Milrinone | Phosphodiesterase inhibitor | Strong |
| Vesnarinone | Phosphodiesterase inhibitor | Mild |
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