Isoxsprin Tablet SR is a medicine used in the treatment of premature labor (when the uterus starts contracting for birth too early than usual). It works on the muscles of the uterus and helps in relieving the contractions. Isoxsprin Tablet SR can be taken with or without food, but take it at the same time to get the most benefit. It should be taken as your doctor's advice. The dose and how often you take it depends on what you are taking it for. Your doctor will decide how much you need to improve your symptoms. Swallow the tablets whole with a drink of water. You should take this medicine for as long as it is prescribed for you. The most common side effects of this medicine include chest pain or discomfort, fast or irregular heartbeat, dizziness, drowsiness, dry mouth, and loss of appetite. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. Before taking the medicine, tell your doctor if you have ever had diabetes, blood pressure, or thyroid. 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. Tell your doctor if you are breastfeeding or if you experience contraction and water break. Your doctor may perform blood pressure and heart rate check-ups while taking this medicine.