Drugs that are receptor antagonists, such as beta blockers, may cause:

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Receptor antagonists, such as beta blockers, can cause an exaggerated response if abruptly discontinued. This is because the body may have compensated for the presence of the drug by increasing the number of receptors or sensitivity to the agonist, and suddenly removing the drug can lead to an overactive response. Downregulation of the drug receptor (A) may occur with prolonged use of the drug, but not with abrupt discontinuation. Partial blockade of the effects of agonist drugs (C) is the intended effect of a receptor antagonist. An exaggerated response to competitive drug agonists (D) is not typically seen with receptor antagonists.

Drugs That Are Receptor Antagonists, Such as Beta Blockers, May