Prevacid®24HR is part of a newer class of acid-reducer medicines called Proton Pump Inhibitors (also known as PPIs). It prevents acid that causes heartburn pain for a full 24 hours with one pill a day. It works by stopping the release of most acid into the stomach. As with all over-the-counter PPIs, although some people get complete relief of symptoms within 24 hours, it may take 1-4 days for full effect.
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