Multidrug

Multidrug refers to the use of more than one drug in treatment, or to resistance to multiple drugs by pathogens or malignant cells. In practice, multidrug strategies are designed to increase efficacy, prevent resistance, and allow lower doses of individual agents.

In clinical therapy, multidrug regimens combine agents with complementary mechanisms to improve outcomes, reduce the risk of resistance, and broaden antimicrobial or anticancer activity.

Common examples include tuberculosis therapy, which uses multiple first-line antibiotics; HIV treatment, which relies on combination antiretroviral therapy; and cancer chemotherapy, which pairs several cytotoxic drugs.

Multidrug resistance (MDR) is a major challenge in medicine. Mechanisms include efflux pumps that remove drugs from cells, enzymatic inactivation, modification of drug targets, and reduced drug uptake.

Effective management requires careful drug selection, attention to interactions and adverse effects, strict adherence, and ongoing surveillance to minimize resistance and toxicity.

Understanding multidrug concepts supports coordinated approaches to treatment, drug development, and stewardship in infectious disease, cancer, and other fields.