The Food and Drug Administration on Monday approved a tuberculosis drug, making it the first new medicine to fight the deadly infection in more than four decades.

The agency approved Johnson & Johnson’s pill, Sirturo, for use with older drugs to fight a hard-to-treat strain of tuberculosis that has not responded to other medications. However, the agency cautioned that the drug does carry risks of potentially deadly heart problems and should be prescribed carefully by doctors.

Roughly, one-third of the world’s population is estimated to be infected with the bacteria causing tuberculosis. While the disease is rare in the U.S., it does kill about 1.4 million people worldwide. Of those, about 150,000 succumb to the increasingly common drug-resistant forms of the disease. About 60 percent of all cases are concentrated in China, India, Russia and Eastern Europe.

According to the Centers for Disease Control and Prevention, there were 3,008 cases of Latinos in the U.S. diagnosed with tuberculosis in 2011. That same year, there were over 10,000 cases in the country.

Sirturo is the first medicine specifically designed for treating multidrug-resistant tuberculosis. That’s a form of the disease that cannot be treated with at least two of the four primary antibiotics used for tuberculosis.

The standard drugs used to fight the disease were developed in the ‘50s and ‘60s.

“The antibiotics used to treat it have been around for at least 40 years and so the bacterium has become more and more resistant to what we have,” explained Chrispin Kambili, a global medical affairs leader for J&J’s Janssen division.

The drug carries a boxed warning indicating that it can interfere with the heart’s electrical activity, potentially leading to fatal heart rhythms.

“Sirturo provides much-needed treatment for patients who don’t have other therapeutic options available,” said Edward Cox, director of the FDA’s antibacterial drugs office. “However, because the drug also carries some significant risks, doctors should make sure they use it appropriately and only in patients who don’t have other treatment options.”

Nine patients taking Sirturo died in company testing compared with two patients taking a placebo. Five of the deaths in the Sirturo group seemed to be related to tuberculosis, but no explanation was apparent for the remaining four.

Despite the deaths, the FDA approved the drug under its accelerated approval program, which allows the agency to clear innovative drugs based on initial promising results.

Last week, the consumer advocacy group Public Citizen criticized that approach, noting the drug's outstanding safety issues.

"The fact that bedaquiline is part of a new class of drug means that an increased level of scrutiny should be required for its approval," the group states. "But the FDA had not yet answered concerns related to unexplained increases in toxicity and death in patients getting the drug."

The FDA said it approved the drug based on two mid-stage studies enrolling 440 patients taking Sirturo. Both studies were designed to measure how long it takes patients to be free of tuberculosis.

Results from the first trial showed most patients taking Sirturo plus older drugs were cured after 83 days, compared with 125 days for those taking a placebo plus older drugs. The second study showed most Sirturo patients were cured after 57 days.

Based on reporting by the Associated Press.

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