Dopamine
Receptors
D1
B1
a1
Actions
Small dose
Act on D1 receptors
Vasodilatation of BV
Increase Renal blood flow
Large dose
Act on a1
Vasocontraction of blood vessels
Increase blood pressure
Moderate
Act on B1
Increase
Catecholamine
Neutral
D1
B1
a1
Small dose
Act on D1 receptors
Vasodilatation of BV
Increase Renal blood flow
Large dose
Act on a1
Vasocontraction of blood vessels
Increase blood pressure
Moderate
Act on B1
Increase
Neutral