Unpredictable effects of some medications in which a patient overreacts or underreacts to a medication or has a reaction different from what is expected are known as:

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Some medications cause unpredictable effects,such as idiosyncratic reactions,in which a patient overreacts or underreacts to a medication or has a reaction different from what is expected.When a patient's immune system causes abnormal reactions to a medication,the patient has a medication allergy.Sudden constriction of bronchiolar muscles,edema of the pharynx and larynx,and severe wheezing and shortness of breath all characterize severe or anaphylactic reactions.A medication interaction occurs when one medication modifies the action of another medication.

Unpredictable Effects of Some Medications in Which a Patient Overreacts