Its effects, depending on dosage, include an increase in sodium excretion by the kidneys, an increase in urine output, an increase in heart rate, and an increase in blood pressure. At low doses it acts through the sympathetic nervous system to increase heart muscle contraction force and heart rate, thereby increasing cardiac output and blood pressure. Higher doses also cause vasoconstriction that further increases blood pressure. While some effects result from stimulation of<unk> receptors, the prominent cardiovascular effects result from<unk> acting at α1, β1, and β2 adrenergic receptors.
Dopamine 
Octopamine
Norepinephrine
Norepinephrine 
Catecholamine
Synephrine
Beta-Endorphin
Prolactin-releasing peptide