This picture is incorrect- the efficacy arrow should be at the peak (maximal) effect of the drug. This is NOT the same as potency which is the amount required to produce an effect of given intensity. One drug can have a higher potency but lower efficacy than another drug.
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Licensing
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This work has been released into the public domain by its author, RichG at English Wikipedia. This applies worldwide. In some countries this may not be legally possible; if so: RichG grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse
Original upload log
The original description page was here. All following user names refer to en.wikipedia.