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Lansoprazole is a drug that is commonly used to treat gastroesophageal reflux, or “heartburn�. It is a proton-pump inhibitor that reduces the stomach’s ability to produce acids. It is also used to treat gastric ulcers and, along with antibiotics, to combat Helicobacter pylori infections. It is in the same drug class as omeprazole (Prilosec), another widely used heartburn remedy.

In 1995, the US Food and Drug Administration granted approval to TAP Pharmaceuticals (a joint venture of Takeda Pharmaceuticals and Abbott Laboratories) to market lansoprazole under the trade name Prevacid. After the drug’s patent protection expired in 2009, several companies began to sell lansoprazole over the counter worldwide.

Earlier this year, S. T. Cole and co-workers at the Swiss Federal Institute of Technology (ETH) in Lausanne included lansoprazole in a screen of compounds for activity against Mycobacterium tuberculosis. They found that in the cellular environment lansoprazole’s sulfoxide group is reduced to sulfide and . Oral administration of the drug significantly reduces TB infections in mice.