Nexium 20 mg is a medication containing esomeprazole, manufactured by AstraZeneca. This package contains 14 tablets, each with 20 mg of the active ingredient. It belongs to a class of medications known as proton pump inhibitors (PPIs). Nexium (esomeprazole) is a prescription medication used to treat certain stomach and esophagus problems. The 20 mg dosage comes in a purple-colored package containing 14 tablets. As this is a prescription medication, it should only be taken under the direction and supervision of a healthcare provider.