Side EffectsJAMA The action or effect of a drug (or vaccine) other than that desired. The term usually refers to undesired
or negative effects, such as headache, skin irritation, or liver damage.Experimental drugs must be
evaluated for both immediate and long-term side effects.
an unintended effect of a drug or therapy, generally
used to refer to a negative effect (e.g., headache, skin rash, liver damage).
See also adverse reaction.
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