Humalog 100IU/ml Solution for Injection 5 x 3 ml is used to treat type 1 and type 2 diabetes mellitus. It contains Insulin lispro, which works similar to the insulin produced by the body. It stops the liver from producing more sugar and also helps move the sugar from the blood into other body tissues where it can be used for energy. Thereby, it helps control blood sugar levels. In some cases, you may experience injection site reactions like redness or swelling. You may also experience symptoms of hypoglycaemia and low blood sugar) such as cold sweat, cool pale skin, nervousness or tremor, anxious feeling, unusual tiredness or weakness, confusion, difficulty in concentration, drowsiness, excessive hunger, temporary vision changes, headache, nausea, and palpitation (very high heartbeat)