U.S. health officials are warning people who take the blood thinner Plavix (clopidogrel) that combining the drug with heartburn meds such as Prilosac, Prevacid, or Protonix may reduce the blood thinner's effectiveness by half. This reduced effectiveness could put patients at a higher risk for suffering a heart attack or stroke. Health officials say people who take Plavix should use other heartburn treatments that are not in the class of drugs known as proton pump inhibitors, including such...