Dopamine acts as a neurotransmitter, increases heart rate, and raises blood pressure in the body. Dopamine is an important neurotransmitter within the brain. A deficiency of dopamine in the body can lead to Parkinson’s disease. Patients will experience symptoms such as tremors and stiffness in the limbs. Dopamine can also be metabolized into norepinephrine, which is an important neurotransmitter in the peripheral nervous system and is involved in the system of control of skeletal muscles by the pyramidal tract. Dopamine has the effect of raising the body’s blood pressure and can sometimes be used to resuscitate patients in shock and hypotension. This is mainly because it constricts small arteries in the peripheral skin and skeletal muscles. Dopamine acts on the human heart and can also increase the contractility of the heart muscle and increase the heart rate, which is also therapeutic for patients with heart failure.