Nexium 20mg is a prescription medication containing esomeprazole, available in a pack of 14 tablets. Manufactured by AstraZeneca, this medication belongs to a class of drugs known as proton pump inhibitors (PPIs). Each tablet contains 20mg of esomeprazole as the active ingredient. The medication comes in a purple-colored box containing 14 tablets. As this is a prescription medication, it should only be taken under the direction and supervision of a healthcare provider.