Rantac Injection 2ml is a medicine that reduces the amount of excess acid made by your stomach. It is used in people who are hospitalized to treat certain conditions in which the stomach produces too much acid. Rantac Injection 2ml is also used to treat ulcers (sores in the lining of the stomach or intestine) which did not get cured with other medications. It is generally administered by a doctor or a nurse. Do not self-administered this medicine at home. The dose will depend on what you are being treated for. Follow the advice of your doctor while taking the medicine. This medicine should relieve indigestion and heartburn within a few hours. You may only need to use it for a short time when you have symptoms. If you are getting the injection to prevent ulcers and other conditions you may need to take it for longer a period. You should keep using it regularly to prevent problems from happening in the future. You may be able to help improve your symptoms by eating smaller meals more often and avoiding spicy or fatty foods.Most people do not experience any side effects while taking the medicine. However, some people may experience headache, constipation, feeling drowsy or tired, and diarrhea. These side effects are usually mild and will go away when you stop taking this medicine or as you adjust to it. Consult your doctor if any of these side effects bother you or do not go away.Before taking it, you should tell your doctor if you have any kidney or liver problems. Also tell your doctor what other medicines you are taking as some may affect, or be affected by, this medicine. This medicine is usually considered safe to take during pregnancy and breastfeeding if it has been prescribed by a doctor. Avoid drinking alcohol as this can increase the amount of acid in your stomach, and make your symptoms worse.