+A [drug](/wiki/Drug) is any [substance](/wiki/Substance) absorbed into a living organism, altering its normal [function](/wiki/Function). These compounds are widely used as [medicine](/wiki/Medicine), or for their psychoactive and physiological effects.
+## See also
+- [Pharmacology](/wiki/Pharmacology)
+- [Toxicity](/wiki/Toxicity)
+- [Treatment](/wiki/Treatment)
... 1 more lines