WASHINGTON –The Food and Drug Administration on Monday approved a Johnson & Johnson tuberculosis drug that is the first new medicine to fight the deadly infection in more than four decades.

The agency approved J&J'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 carries 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. The disease is rare in the U.S., but kills about 1.4 million people a year 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.