Rantinol Syrup is a medication that reduces stomach acid, treating heartburn, indigestion, and other symptoms caused by excessive stomach acid. It is also used to prevent stomach ulcers, reflux disease, and rarer conditions. It is recommended to take the medicine regularly to prevent future problems. Common side effects include headache, constipation, drowsiness, and diarrhea. Before taking it, inform your doctor about any kidney or liver problems, and any other medications you are taking. It is generally safe to take during pregnancy and breastfeeding if prescribed by a doctor. Avoid alcohol to reduce stomach acid levels.