+A **drug effect** is the observable change a substance induces within a living system. These changes, stemming from the [drug](/wiki/drug)'s [mechanism](/wiki/mechanism) of action, can be therapeutic or adverse, altering physiology or mood.
+## See also
+- [Dose](/wiki/dose)
+- [Pharmacology](/wiki/pharmacology)
+- [Side Effect](/wiki/side_effect)
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