Retain Injection is used to prevent premature labor in pregnant women in order to reduce the risk of giving birth too early (preterm birth). It prevents miscarriage and lowers the risk of premature birth in women who have had one premature delivery in the past. Retain Injection is administered only by or under the supervision of a doctor. It should be taken as your doctor advice. Your doctor will decide how much you need to take and for how much time. You should take this injection for as long as it is prescribed for you. The most common side effects of this medicine include local site reactions at the injection site, Nausea, itching, diarrhea, and hives. If any of these bothers you, let your doctor know. There may be ways of reducing or preventing them. It may affect blood sugar levels, so monitor your blood sugar regularly. It is better to inform the doctor if you notice yellowing of eyes or skin, dark urine, or stomach pain while using this medicine. Before taking this medicine inform doctor, if you have ever had any problems with your blood circulation or have diabetes, or any liver disease. Your doctor should also know about all other medicines you are taking as many of these may make this medicine less effective or change the way it works.