Diabetes Home > Lantus

Lantus is a long-acting insulin medication used to control blood sugar levels in people with diabetes. The drug works by providing a steady amount of insulin throughout the day, which helps the body remove sugar from the blood. It comes in injectable form and is taken once a day. Possible side effects of Lantus include reactions at the injection site and low blood sugar levels.

What Is Lantus?

Lantus® (insulin glargine) is a prescription diabetes medication licensed to treat the following conditions:
Lantus is a long-acting insulin that is designed to be taken just once a day.
(Click Lantus Uses for more information, including possible off-label uses.)

Who Makes Lantus?

It is manufactured by sanofi-aventis.

Effects of Lantus

Studies have shown that a single daily dose of Lantus provides a steady level of insulin for 24 hours, without any significant peaks. Theoretically, this may help reduce the chance of dangerously low blood sugar (hypoglycemia).

How Does It Work?

Lantus is a form of insulin, which is a hormone that is naturally produced by the pancreas. This hormone is important for several functions, such as controlling blood sugar. Insulin helps the cells of your body remove glucose ("sugar") from your bloodstream. This sugar fuels your body's cells, giving them the energy they need to work properly.
Normally, your body is able to maintain proper levels of sugar in your blood and inside your cells. However, in people with type 1 diabetes (and sometimes type 2 diabetes), the pancreas has trouble making insulin. This causes too much sugar to accumulate in the blood. Too much sugar can also accumulate in the blood if your body has trouble responding to normal levels of insulin, as is common in type 2 diabetes. Over time, high levels of sugar in the blood can lead to serious health problems in the eyes, feet, hands, kidneys, and heart.
You may need to take insulin if your pancreas has trouble making enough, which is the case in people with type 1 diabetes and in some people who have type 2 diabetes.
Lantus is a long-acting insulin medication. Although it is a solution (liquid) before injection, once Lantus is injected, it forms small particles that dissolve slowly and evenly over time. As a long-acting insulin, Lantus helps to work as a "basal" insulin, which means that it provides a steady background level of insulin to help control blood sugar throughout the day. For controlling a spike in blood sugar levels after meals, other types of insulins may need to be used in addition to Lantus.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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