Hiatus hernia is a condition in which part of the stomach moves upwards into the chest area through the opening in the diaphragm. It often causes symptoms such as acid reflux, heartburn, bloating, or chest discomfort. Histac 300 Tablet contains ranitidine, a medicine that reduces stomach acid and can help relieve these symptoms. However, ranitidine has been withdrawn or restricted in several countries due to concerns about impurities found in some batches. Because of this, it is generally not recommended for long term use unless your doctor has specifically advised it. If you are currently taking it, do not stop suddenly on your own, as your symptoms may return. It is important to speak to your doctor, who may suggest a safer alternative medicine such as famotidine or a proton pump inhibitor like omeprazole or pantoprazole, depending on your symptoms. Along with medicines, lifestyle changes such as eating smaller meals, avoiding late-night food, and raising the head while sleeping may also help reduce symptoms.