Alpostin 500mcg Injection is used to treat patent ductus arteriosus (PDA), a heart defect that occurs in newborns. It improves blood circulation in such babies and helps treat this defect. Alpostin 500mcg Injection is given as an injection by a doctor or nurse and should not be used without medical supervision. The most common side effects of this medicine are interrupted breathing (apnea) and a high temperature for a short time period (transient pyrexia/fever). If your baby has these or any other side effects, let your doctor know. All babies can have Alpostin 500mcg Injection if they need it. The doctor will carry out tests before deciding whether to give this medicine to your baby. However, if your baby develops any signs of allergy to this medicine, such as wheezing, breathlessness, swelling of the face, hands, itchy rash, or redness of the skin, it is advised to not use this medicine. Consult your doctor if you have any doubts.