Insulin glargine is a man-made form of a hormone that is produced in the body. It works by lowering levels of glucose (sugar) in the blood. Insulin glargine is a long-acting form of insulin that is slightly different from other forms of insulin that are not man-made.

Insulin glargine is used to treat type 1 or type 2 diabetes. Some brands of this medicine are for use only in adults. Carefully follow all instructions for the brand of insulin glargine you are using.

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  • Basaglar KwikPen, Lantus, Lantus Solostar Pen, Toujeo SoloStar
  • Severity: Major
    You should check with your doctor immediately if any of these side effects occur when taking insulin glargine:

    More common:
    Anxiety
    behavior change similar to being drunk
    blurred vision
    chills
    cold sweats
    coma
    confusion
    convulsions (seizures)
    cool, pale skin
    difficulty with thinking
    dizziness or lightheadedness
    drowsiness
    excessive hunger
    fast heartbeat
    headache
    nausea
    nervousness
    nightmares
    restless sleep
    shakiness
    slurred speech
    tingling in the hands, feet, lips, or tongue
    unconsciousness
    unusual tiredness or weakness
    Less common or rare:
    Fast pulse
    skin rash or itching over the entire body
    sweating
    trouble breathing
    Incidence not known:
    Bloating or swelling of the face, hands, lower legs, or feet
    cough
    decreased urine
    difficulty swallowing
    dry mouth
    hives
    increased thirst
    irregular heartbeat
    muscle pain or cramps
    numbness or tingling in the hands, feet, or lips
    puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
    rapid weight gain
    vomiting
    Severity: Minor
    Some of the side effects that can occur with insulin glargine may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

    More common:
    Fever
    sore throat
    stuffy or runny nose
    Less common or rare:
    Depression of the skin at the injection site
    itching, pain, redness, or swelling at the injection site
    thickening of the skin at injection site
  • (subcutaneous solution)