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Why does multidrug therapy help prevent drug-resistant leprosy?

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Sign reading Gandhiji Prem Nivas Leprosy Centre Titagarh conducted by Missionaries of Charity, with a crucifix above the sign on a decorated building facade. — leprosy The Gandhiji Prem Nivas is a center for people with leprosy that was established by Mother Teresa in 1958 and is run by the Missionaries of Charity in Titagarh, India.

Multidrug therapy helps prevent drug-resistant leprosy by utilizing a combination of two or more antileprosy drugs simultaneously. This approach was developed after researchers observed that Mycobacterium leprae—the bacillus that causes the disease—began developing resistance to single-drug treatments, such as the earliest class of antileprosy drugs known as sulfones.12

By administering multiple medications, the regimen ensures that if the bacteria develop a resistance to one drug, the other agents in the combination continue to effectively kill the bacilli. This strategy, which is also widely used in the treatment of tuberculosis and AIDS, is the current standard recommended by the World Health Organization to prevent the emergence of resistant strains and ensure the disease remains curable.12