The first drug that is effective in treating peptic ulcers is the Omeprazole oral capsule used to reduce the amount of acid in the stomach. It is more effective In treating gastric ulcers, duodenal ulcers, erosive esophagitis, gastroesophageal ulcers, and hyper-secretory conditions. It can also use to treat bacterial infections such as helicobacter pylori. The recommended dose of Omeprazole is 20rams once a day for duodenal ulcers. The drug takes about fourteen days to see results, and they start to heal after two weeks. In patients where the healing did not occur within the two weeks, it can happen a few days after the 14th day but not more than four weeks (Van Oosten et al., 2019). The fact that the medication is effective, it also has side effects. Studies s has found out that the patient treated by Omeprazole had a bacterial infection in their guts in contrast to patients who did not use the drug. They’re not just gut bacteria but harmful bacterial such as streptococcus, staphylococcus, Enterococcus, and Escherichia coli. Another side effect of this drug is that it can lead to heart complications due to more extended use of Omeprazole can lead to cardiovascular issues such as heart attack.