Esomeprazole 40 mg Gastro-resistant Tablets 14 Tablets is used to treat some conditions of the stomach and oesophagus (e.g. acid reflux, ulcers). It functions by reducing the stomach's amount of acid. It alleviates symptoms such as sternum, swallowing difficulty, and lingering toxins. It alleviates symptoms such as sternum, swallowing difficulty, and lingering toxins. Headache, diarrhoea and stomach pain are common side effects. Some are mild and go away if you don't take the medication. The brands Nexium, Nexium Power, Emozul and Ventra are called Esomeprazole.