Sanofi Diabetes

Signs of Low Blood Sugar

Even if you’re successful at managing your diabetes, your blood sugar may still get low from time to time.

This is called hypoglycemia, and if left untreated, it can be very serious. Severe hypoglycemia can be dangerous and can cause harm to your heart or brain. It may cause unconsciousness, seizures, or death. It’s important to know the signs so you can act quickly.

Common causes of low blood sugar are illness, emotional or physical stress, too much insulin, too little food or missed meals, and too much exercise or activity.

The importance of checking your blood sugar

Checking your blood sugar regularly and as directed by your doctor is part of managing diabetes. The results will tell you when your sugar is low and that you need to treat it. Because signs and symptoms of low blood sugar can be non-specific, it is important to check your blood sugar, if possible, when you suspect it may be low. Some people have few or no warning symptoms.

The signs and symptoms of hypoglycemia (low blood sugar)

Some signs and symptoms of low blood sugar include:

  • Shakiness
  • Dizziness
  • Sweating
  • Clumsy movements
  • Sudden changes in behavior

How to treat low blood sugar

If you have hypoglycemia, you can raise your blood sugar with something that contains glucose—an apple, juice, some pieces of candy, or glucose tablet. Wait 15 or 20 minutes and check your blood sugar levels again. If they’re still low and the symptoms don't go away, repeat the treatment. Check with your doctor on how much to take to be sure not to overtreat.


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Prescription LANTUS® is a long-acting insulin used to treat adults with type 2 diabetes and adults and children (6 years and older) with type 1 diabetes for the control of high blood sugar. It should be taken once a day at the same time each day to lower blood glucose.

Do not use LANTUS® to treat diabetic ketoacidosis.

Important Safety Information for Lantus®

Do not take Lantus® if you are allergic to insulin or any of the inactive ingredients in Lantus®.

You must test your blood sugar levels while using insulin, such as Lantus®. Do not make any changes to your dose or type of insulin without talking to your healthcare provider. Any change of insulin should be made cautiously and only under medical supervision.

Please click here for additional Important Safety Information.

Please click here for Full Prescribing Information.


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Important Safety Information for Lantus®

Do not take Lantus® if you are allergic to insulin or any of the inactive ingredients in Lantus®.

You must test your blood sugar levels while using insulin, such as Lantus®. Do not make any changes to your dose or type of insulin without talking to your healthcare provider. Any change of insulin should be made cautiously and only under medical supervision.

Do NOT dilute or mix Lantus® with any other insulin or solution. It will not work as intended and you may lose blood sugar control, which could be serious. Lantus® must only be used if the solution is clear and colorless with no particles visible. Do not share needles, insulin pens or syringes with others.

The most common side effect of insulin, including Lantus®, is low blood sugar (hypoglycemia), which may be serious. Some people may experience symptoms such as shaking, sweating, fast heartbeat, and blurred vision. Severe hypoglycemia may be serious and life threatening. It may cause harm to your heart or brain. Other possible side effects may include injection site reactions, including changes in fat tissue at the injection site, and allergic reactions, including itching and rash. In rare cases, some allergic reactions may be life threatening.

Tell your doctor about other medicines and supplements you are taking because they can change the way insulin works. Before starting Lantus®, tell your doctor about all your medical conditions including if you have liver or kidney problems, are pregnant or planning to become pregnant, or are breast-feeding or planning to breast-feed.

Lantus® SoloSTAR® is a disposable prefilled insulin pen. Please talk to your healthcare provider about proper injection technique and follow instructions in the Instruction Leaflet that accompanies the pen.

Click here for full prescribing information for Lantus®.

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The health information contained herein is provided for general educational purposes only. Your healthcare professional is the single best source of information regarding your health. Please consult your healthcare professional if you have any questions about your health or treatment.