Nexium 20mg is a medication containing esomeprazole, available in a pack of 14 tablets. Manufactured by AstraZeneca, this prescription medication is used to treat certain stomach and esophageal conditions. Each tablet contains 20mg of esomeprazole as the active ingredient. The medication comes in a purple-colored box containing 14 tablets. This is a prescription-only medication that should be taken as directed by your healthcare provider.