Mode of action

Mode of action (MoA) refers to the specific biochemical interaction through which a drug substance produces its pharmacological effect. This usually involves the drug binding to a particular enzyme or receptor in the body. The MoA is important in understanding the effects and side effects of drugs, and can be used to classify drugs within broader groups.

Mechanism of Action vs Mode of Action

While the terms "mechanism of action" and "mode of action" are often used interchangeably, they do have distinct meanings. The mechanism of action refers to the specific biochemical interaction through which a drug substance produces its pharmacological effect, while the mode of action refers to the general manner in which a drug causes its effect.

Drug Receptor Interaction

The interaction between a drug and its receptor is key to its mode of action. This interaction can be described in terms of affinity (how strongly the drug binds to the receptor) and efficacy (the ability of the drug-receptor complex to produce a physiological response).

Classification of Drugs

Drugs can be classified based on their mode of action. For example, antibiotics can be classified as bactericidal (they kill bacteria) or bacteriostatic (they inhibit bacterial growth). Similarly, antidepressants can be classified based on whether they increase the levels of certain neurotransmitters in the brain.

See Also

• Pharmacodynamics
• Pharmacokinetics
• Drug discovery
• Drug design