Nexium is a daily medication used to control moderate to severe cases of heartburn and acid reflux by reducing the amount of acid in the stomach. A daily dosage journal is beneficial when one logs the time of each dose and also what foods and symptoms were observed for that day. maintaining such a log of detailed and relevant information can better help one ascertain whether the Nexium dose is correct, whether it needs adjusted or perhaps if the medication needs taken at different times during the day or evening.