+A **drug interaction** occurs when the effects of one [drug](/wiki/drug) are altered by the presence of another [substance](/wiki/substance), including other medications, food, or supplements. This can lead to unexpected changes in therapeutic outcomes or increased [Adverse Effects](/wiki/adverse_effects).
+## See also
+- [Drug Metabolism](/wiki/drug_metabolism)
+- [Pharmacology](/wiki/pharmacology)
+- [Medication](/wiki/medication)
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