What are the side effects of Lantus?

You may experience three classes of side effects from Lantus: side effects from the injection, effects of hypoglycemia, and effects of hyperglycemia. 

You may feel swelling, itching, redness, or pain on your skin where you have injected Lantus. Lantus can affect the fat below your skin, causing small depressions or thickening as the fat sheds or accumulates.

Lantus may reduce the amount of sugar in your blood too much. This is called hypoglycemia and may occur when you have not eaten in several hours, exercise more than usual, or take more insulin than necessary. If you feel faint, weak, sweaty, dizzy, drowsy, hungry, or anxious; have pale skin or a numb mouth; or move awkwardly, you may be experiencing hypoglycemia. To avoid serious complications from a low blood-sugar level, you will need to eat something with sugar in it, such as a non-diet pop or soda or a candy bar. Having a sugary food or drink handy at all times can prevent confusion, seizures, or loss of consciousness, signs of a serious diabetic condition.

High blood sugar, or hyperglycemia, results when you have too little insulin in your body. You may have hyperglycemia if you are urinating frequently, you are extremely hungry or thirsty, you are weak, or your sight is blurred. Hyperglycemia can lead to diabetic ketoacidosis, a life-threatening condition. Side effects of diabetic ketoacidosis include shortness of breath, decreased consciousness, dry mouth, nausea and vomiting, and fruity breath.

If you develop an allergic reaction, including swelling, hives, vision changes, chills, confusion, vertigo, fatigue, fast heartbeat or breathing, headache, hoarseness, nervousness, seizures, pain, sweating, tremor, or weakness, contact your doctor immediately.


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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.