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Potency is an index of the concentration required for a given effect - usually the EC50. It is not the same as effect.

Drugs that are highly potent require only small doses (concentrations) to achieve their effects.

High potency is often considered desirable because less drug (in molar terms) is available to cause adverse effects.

Move the slider to see how the curve alters when potency changes.

Effect (%)

Concentration (log)

Low High