home > drugs a-z list > humalog (insulin lispro (human analog)) drug center > humalog (insulin lispro (human analog)) drug - consumer side effects and precautions

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if this unlikely but serious side effect occurs: muscle pain.

This medication can cause low blood sugar (hypoglycemia). This effect may occur if you do not consume enough calories (from food, juices, fruit, etc.) or if you have taken too much insulin lispro. The symptoms include chills, cold sweat, blurred vision, dizziness, drowsiness, shaking, rapid heart rate, weakness, headache, fainting, tingling of the hands or feet, and hunger. It is a good habit to carry glucose tablets or gel to treat low blood sugar. If you don't have these reliable forms of glucose, quickly raise your blood sugar level by eating a quick source of sugar such as table sugar, honey, or candy, or drink a glass of orange juice or non-diet soda. Tell your doctor immediately about the reaction. To help prevent hypoglycemia, eat meals on a regular schedule, and do not skip meals. Check with your doctor or pharmacist about what you should do if you miss a meal.

Too little insulin lispro can cause symptoms of high blood sugar (hyperglycemia). Symptoms include thirst, increased urination, confusion, drowsiness, flushing, rapid breathing, and fruity breath odor. If these symptoms occur, tell your doctor immediately. Your dosage may need to be increased.

A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, fast heartbeat, sweating, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before using insulin lispro, tell your doctor or pharmacist if you are allergic to it; or to other insulins; or if you have any other allergies. This product may contain inactive ingredients (such as cresol), which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Do not use this medication when you have low blood sugar (hypoglycemia).

Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease, liver disease, thyroid problems.

You may experience blurred vision, dizziness, or drowsiness due to extremely low or high blood sugar levels. Do not drive, use machinery, or do any activity that requires alertness or clear vision until you are sure you can perform such activities safely.

Limit alcohol while taking this medication because it can increase the risk of developing hypoglycemia.

During times of stress, such as fever, infection, injury or surgery, it may be more difficult to control your blood sugar. Consult your doctor because a change in your medication or how often you test your blood sugar may be required.

Check your blood sugar readings before and after exercise. You may need a snack beforehand.

If traveling across time zones, ask your doctor about how to adjust your insulin schedule. Take extra insulin and supplies with you.

The elderly may be more sensitive to the effects of this drug, especially hypoglycemia.

Children may be more sensitive to the effects of this drug, especially hypoglycemia. When used in children, diluting insulin lispro before injecting is recommended. Ask your pharmacist about the correct way to dilute insulin.

Tell your doctor if you are pregnant before using this medication. If you are planning pregnancy, discuss a plan for managing your blood sugars with your doctor before you become pregnant. Your doctor may switch the type of insulin you use during pregnancy. Consult your doctor for more details.

It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.