Dopamine can be administered intravenously, typically at a dose of 20 mg directly into the vein, or intravenously by drip treatment. When dopamine is administered intravenously by drip, the dosage varies and it works differently. Dopamine is a neurotransmitter that can be used to help cells transmit impulses.1. Low doses of dopamine, which can relatively selectively dilate visceral and renal arteries, can be used in patients who do not respond to diuretics to increase renal blood flow and maintain glomerular filtration rate; it can also act directly on the renal tubules to achieve diuretic effects.2. Moderate doses of dopamine can increase the heart’s adrenergic receptor activity and strengthen the contractility of the heart muscle.3. High doses of dopamine can cause widespread vasoconstriction and have an elevating effect on blood pressure.