A drug may be classified by the chemical type of the active ingredient or by the way it is used to treat a particular condition. Each drug can be classified into one or more drug classes.
Vasodilators are agents that widen the blood vessels therefore cause a decrease in vascular resistance and an increase in blood flow. They may act by activation of the vasomotor center in the brain, which brings about relaxation of the smooth muscle in the blood vessel walls or they can act locally on blood vessel smooth muscle cells.
Vasodilators are used to treat hypertension, angina and congestive heart failure.
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