Megaparin 40 Injection is an anticoagulant used to prevent and treat harmful blood clots. It stops the existing clots from getting any bigger and restricts the formation of any new clot. It is also helpful in the prevention of blood clots in veins, a condition called deep vein thrombosis, and pulmonary embolism. Megaparin 40 Injection is injected under the skin by a doctor or nurse. It should not be injected into a muscle. The dose and length of treatment are based on your medical condition, your response to the medicine, and what you are being treated for. It may also be based on your age and weight. It is important to keep using this medicine even if you do not notice any symptoms because it is preventing future harm. If you stop taking it, you could get a blood clot. While taking this medicine you should avoid doing things that increase your risk of bleeding or injury. The most common side effect of this medicine include bleeding, headache, increased blood platelets, and increased liver enzymes. A severe headache could be a sign of bleeding in the brain. A severe stomach ache could be a sign of bleeding in the stomach. Bleeding can be dangerous and may not be obvious. Look out for symptoms and tell your doctor if you are worried. Before using this medicine, you should tell your doctor if you have high blood pressure, diabetes, or have had a recent stroke. You should not take it if you have any current bleeding. Some medicines should not be used with Megaparin 40 Injection. Tell your doctor what else you are taking to make sure it is safe. If you have low body weight, you may be at increased risk of bleeding, and drinking alcohol can increase the risk of stomach bleeding.