: ''For other uses of analog, see [[Analog (disambiguation)]].''
'''* [[Functional analogs'''analog ('''functional analogues'''chemistry)]], are [[chemical compound|compounds]] that have similar [[physics|physical]], [[chemistry|chemical]], [[biochemistry|biochemical]], or [[pharmacology|pharmacological]] properties. An example of a functional analog (and structural analog) is [[morphine]] and [[heroin]]. Functional analogs are not necessarily also [[structural analog]]s with a similar [[chemical structure]]. Examples are classes of [[drug]]s that have a similar mechanism of action.
* [[Functional analog (electronic)]], electronic entities that can be interchanged to fulfill the same function
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== See also ==
* [[Structural analog]], compounds with similar chemical structure
