Basalog 100IU/ml Injection is a long-acting type of insulin used to treat types 1 and 2 diabetes mellitus in both adults and children. It provides a steady level of insulin in the body for an entire day and helps control blood sugar levels. This helps to prevent complications of diabetes. Basalog 100IU/ml Injection can be prescribed alone or along with fast-acting insulin or other diabetes medicines. Your doctor or nurse will teach you the correct way of injecting it under the skin. You should use this medicine regularly as per the dose advised to get the maximum benefit. If you stop taking it, your blood sugar levels may rise very high which may put you at risk of serious complications. It is only a part of the treatment program that should also include a healthy diet, regular exercise and weight reduction as advised by your doctor. The most common side effect of this medicine is low blood sugar levels (hypoglycemia). To prevent this, it is important to inject only the correct dose of medicine, have regular meals, and monitor your blood sugar levels regularly. Drinking excessive alcohol can also lead to a fall in your blood sugar levels. Other side effects include allergy at the injection site like redness, swelling, or hard lumps (lipohypertrophy). Some people gain weight while taking insulin. Do not use this medicine when you have low blood sugar levels. Before starting the treatment, inform your doctor if you have ever had kidney, liver or heart problems. Pregnant or breastfeeding women should consult their doctor before using it.