Risek 40mg Capsules 14’s contain omeprazole which treats acidity and peptic ulcer disease. Also, it treats gastroesophageal reflux disease. Omeparazole works by reducing the amount of acid in the stomach. As a result, it helps in relief of acid related indigestion and heartburn. This is where acid from the stomach escapes into the gullet (the tube which connects your throat to your stomach) causing pain, inflammation and heartburn.