Operation Shark Fin's Nexium, marketed as the new purple pill, was nothing more than one of Prilosec's enantiomers. But unlike the antihistamines that had to be withdrawn from the market ...

Drugs like Nexium, Prevacid, and Prilosec are called proton pump inhibitors, or PPIs, and they've been linked to a bigger risk for dementia. PPIs reduce the amount of acid that your stomach makes.

PPIs are among the highest-selling classes of drugs in the U.S., with $9.5 billion in sales last year, and one of them, Nexium ... Three—omeprazole (Prilosec, Prilosec OTC), lansoprazole ...