Which statement best defines synergism in pharmacology?

Which statement best defines synergism in pharmacology?

• A. The interaction of drugs such that the total effect is greater than the sum of the individual effects
• B. The total effect equals the sum
• C. Antagonism
• D. Potentiation

Answer: (A)

Synergism in pharmacology means that when two drugs are used together, their combined effect is greater than the sum of their individual effects. This occurs when the drugs enhance each other’s actions through complementary mechanisms, producing a super-additive response. For example, two agents that target different steps in a process can produce a larger overall effect than simply adding their separate effects. This differs from an additive interaction, where the total effect equals the sum of each drug’s effect, and from antagonism, where one drug reduces the effect of the other. Potentiation is related but refers to one drug increasing the effect of another without that drug having its own effect in isolation.

Synergism in pharmacology means that when two drugs are used together, their combined effect is greater than the sum of their individual effects. This occurs when the drugs enhance each other’s actions through complementary mechanisms, producing a super-additive response. For example, two agents that target different steps in a process can produce a larger overall effect than simply adding their separate effects.

This differs from an additive interaction, where the total effect equals the sum of each drug’s effect, and from antagonism, where one drug reduces the effect of the other. Potentiation is related but refers to one drug increasing the effect of another without that drug having its own effect in isolation.