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Most Commonly Used

Lantus 100units/mL for Inj
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Also See:

  • Answers to Frequently-Asked Questions (FAQs)
  • Other Class Related Drugs
  • Additional Patient Usage Statistics

Common Side Effects of Lantus
Lantus can cause side effects. Tell your doctor if you have any side effect of Lantus that is severe or will not go away. The most common side effect of Lantus is low blood sugar, also known as hypoglycemia. If too much insulin is in your blood, your blood sugar level can get too low. Low blood sugar can also be caused by skipping meals or exercising without eating enough calories.

If your blood sugar is too low, common signs and symptoms include:
  • Headache
  • Chills
  • Sweating
  • Hunger
  • Weakness
  • Tremors
  • Irritability
  • Trouble concentrating
  • Rapid breathing
  • Tingling in the hands or feet
  • Feeling faint or fainting
If left untreated, hypoglycemia can be serious. It can quickly lead to unconsciousness, seizures, or even death. Keep a quick source of sugar handy at all times. This can include candy, juice, table sugar, or glucose tablets that you can take in the event you notice any of the signs or symptoms of hypoglycemia.

Other side effects of Lantus may include the following:
  • High blood sugar (which is called hyperglycemia). This happens when there is not enough insulin in the blood. You may feel thirsty and urinate more often than usual. Drowsiness, rapid breathing, flushing, and a fruity-smelling breath odor are other signs.
  • Low blood potassium. When this happens, it can cause muscle cramps, weakness, and irregular heartbeat.
You can help prevent hypoglycemia by eating regular meals while taking Lantus. Ask your doctor what others steps you can take to prevent hyperglycemia or low potassium levels from happening.

Lantus can cause a rare but serious allergic reaction. Tell your doctor immediately, or call 911 in an emergency, if you have:
  • A rash
  • Itching
  • Swelling of the throat, lips, tongue, or neck
  • Trouble breathing
  • Extreme dizziness
Report any of these side effects of Lantus to your doctor. He or she may need to adjust your Lantus dose.

While taking Lantus, you will need to monitor your blood sugar closely and adjust your dose. Talk to your family or friends about what they should do if you are unable to help yourself during a hypoglycemic or hyperglycemic event.

Lantus can interact with certain other medicines. Tell your doctor about any medicines you take, including over-the-counter remedies, and dietary supplements. Also, tell your doctor about any medical condition that you may have. Your doctor will want to determine if Lantus is the right medicine for you.