The mode of action of a drug may be defined as?

The mode of action of a drug refers to the specific biological mechanism through which it produces its therapeutic effects. This includes the interactions between the drug and cellular receptors, enzymes, or other molecules within the body that lead to a desired change in physiological function. Understanding how a drug works at the molecular or cellular level helps health professionals optimize treatment protocols, predict efficacy, and minimize adverse reactions.

For instance, a drug might work by inhibiting a particular enzyme involved in a disease process or by blocking a receptor that mediates certain cellular responses. This detailed knowledge is crucial for ensuring that the right drug is prescribed for the right condition and that expected outcomes are achieved. Other options, such as the method of administration, side effects, or chemical composition, are important aspects of pharmacology, but they do not define the specific way a drug exerts its therapeutic action.