Final answer:
Vasodilators widen blood vessels to reduce blood pressure, while vasoconstrictors constrict blood vessels to increase blood pressure.
Explanation:
Vasodilators are medications that cause widening of blood vessels, leading to a decrease in blood pressure. On the other hand, vasoconstrictors, like antihistamines and decongestants, cause vasoconstriction, resulting in an increase in blood pressure and volume.
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