Final answer:
Omeprazole can cause several digestive-related side effects, including constipation. It works by reducing stomach acid production but can also affect gut motility and the natural pH balance of the stomach.
Step-by-step explanation:
The side effect given off by omeprazole is constipation. Omeprazole is a proton pump inhibitor that is used to treat conditions like gastroesophageal reflux disease (GERD) and stomach ulcers by reducing the production of stomach acid. While it is effective in decreasing acid production and the symptoms associated with excess acid, it can lead to side effects affecting the digestive system. This includes indigestion, heartburn, stomach pain, nausea, diarrhea, and constipation. These effects can be evident as omeprazole alters the natural pH balance of the stomach and may affect gut motility.