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Lantus Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Lantus (insulin glargine [rdna origin]) Injection is used to treat type 1 (insulin-dependent) or type 2 (non insulin-dependent) diabetes. It is a man-made form of a hormone that is produced in the body. Common side effects include pain, redness, swelling or itching at the injection site. These effects usually go away after a few days or weeks.

Lantus should be administered subcutaneously (under the skin) once a day at the same time every day. Dose is determined by the individual and the desired blood glucose levels. Lantus may interact with albuterol, clonidine, reserpine, or beta-blockers. Many other medicines can increase or decrease the effects of insulin glargine on lowering your blood sugar. Tell your doctor all prescription and over-the-counter medications and supplements you use. Tell your doctor if you are pregnant before using Lantus. Discuss a plan to manage blood sugar with your doctor before becoming pregnant. Your doctor may switch the type of insulin you use during pregnancy. It is unknown if this drug passes into breast milk. Insulin needs may change while breast-feeding. Consult your doctor before breast-feeding.

Our Lantus (insulin glargine [rdna origin]) Injection Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Patient Information in Detail?

Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.

Lantus in Detail - Patient Information: Side Effects

Get emergency medical help if you have any of these signs of insulin allergy: itching skin rash over the entire body, wheezing, trouble breathing, fast heart rate, sweating, or feeling like you might pass out.

Hypoglycemia, or low blood sugar, is the most common side effect of insulin glargine. Symptoms include headache, hunger, weakness, sweating, tremors, irritability, trouble concentrating, rapid breathing, fast heartbeat, fainting, or seizure (severe hypoglycemia can be fatal). Carry hard candy or glucose tablets with you in case you have low blood sugar.

Tell your doctor if you have itching, swelling, redness, or thickening of the skin where you inject insulin glargine.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Lantus (Insulin Glargine [rDNA origin] Injection) »

What is Patient Information Overview?

A concise overview of the drug for the patient or caregiver from First DataBank.

Lantus Overview - Patient Information: Side Effects

SIDE EFFECTS: See also the How to Use section.

Pain, redness, swelling or itching at the injection site may occur. These effects usually go away after a few days or weeks. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Too much insulin can cause low blood sugar (hypoglycemia). This effect may also occur if you do not consume enough calories. The symptoms include chills, cold sweats, blurred vision, dizziness, drowsiness, shaking, fast heartbeat, weakness, headache, fainting, tingling of the hands/feet, or hunger. It is a good habit to carry glucose (sugar) tablets or gel to treat low blood sugar. If you don't have these reliable forms of glucose, raise your blood sugar quickly by eating a quick source of sugar such as table sugar, honey, candy, or drinking a glass of fruit juice or non-diet soda. Tell your doctor immediately about the reaction. To help prevent low blood sugar, eat meals on a regular schedule and do not skip meals.

Too little insulin can cause high blood sugar (hyperglycemia). Symptoms of high blood sugar include thirst, increased urination, confusion, drowsiness, flushing, rapid breathing, or fruity breath odor. If these symptoms occur, tell your doctor immediately. Your treatment plan may need to be changed.

This medication may cause low potassium levels in the blood (hypokalemia). Tell your doctor immediately if any of these unlikely but serious side effects occur: muscle cramps, weakness, irregular heartbeat.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the entire patient information overview for Lantus (Insulin Glargine [rDNA origin] Injection)»

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Lantus FDA Prescribing Information: Side Effects
(Adverse Reactions)


The following adverse reactions are discussed elsewhere:

Clinical trial experience

Because clinical trials are conducted under widely varying designs, the adverse reaction rates reported in one clinical trial may not be easily compared to those rates reported in another clinical trial, and may not reflect the rates actually observed in clinical practice.

The frequencies of treatment-emergent adverse events during LANTUS clinical trials in patients with type 1 diabetes mellitus and type 2 diabetes mellitus are listed in the tables below.

Table 1: Treatment -emergent adverse events in pooled clinical trials up to 28 weeks duration in adults with type 1 diabetes (adverse events with frequency ≥ 5%)

NPH, %
Upper respiratory tract infection 22.4 23.1
Infection * 9.4 10.3
Accidental injury 5.7 6.4
Headache 5.5 4.7
*Body System not Specified

Table 2: Treatment -emergent adverse events in pooled clinical trials up to 1 year duration in adults with type 2 diabetes (adverse events with frequency ≥ 5%)

NPH, %
Upper respiratory tract infection 11.4 13.3
Infection* 10.4 11.6
Retinal vascular disorder 5.8 7.4
*Body System not Specified

Table 3: Treatment -emergent adverse events in a 5-year trial of adults with type 2 diabetes (adverse events with frequency ≥ 10%)

NPH, %
Upper respiratory tract infection 29 33.6
Edema peripheral 20 22.7
Hypertension 19.6 18.9
Influenza 18.7 19.5
Sinusitis 18.5 17.9
Cataract 18.1 15.9
Bronchitis 15.2 14.1
Arthralgia 14.2 16.1
Pain in extremity 13 13.1
Back pain 12.8 12.3
Cough 12.1 7.4
Urinary tract infection 10.7 10.1
Diarrhea 10.7 10.3
Depression 10.5 9.7
Headache 10.3 9.3

Table 4: Treatment -emergent adverse events in a 28-week clinical trial of children and adolescents with type 1 diabetes (adverse events with frequency ≥ 5%)

NPH, %
Infection* 13.8 17.7
Upper respiratory tract infection 13.8 16
Pharyngitis 7.5 8.6
Rhinitis 5.2 5.1
*Body System not Specified

Severe Hypoglycemia

Hypoglycemia is the most commonly observed adverse reaction in patients using insulin, including LANTUS [See WARNINGS AND PRECAUTIONS]. Tables 5 and 6 summarize the incidence of severe hypoglycemia in the LANTUS individual clinical trials. Severe symptomatic hypoglycemia was defined as an event with symptoms consistent with hypoglycemia requiring the assistance of another person and associated with either a blood glucose below 50 mg/dL ( ≤ 56 mg/dL in the 5-year trial) or prompt recovery after oral carbohydrate, intravenous glucose or glucagon administration. The rates of severe symptomatic hypoglycemia in the LANTUS clinical trials (see Section 14 for a description of the study designs) were comparable for all treatment regimens (see Tables 5 and 6). In the pediatric phase 3 clinical trial, children and adolescents with type 1 diabetes had a higher incidence of severe symptomatic hypoglycemia in the two treatment groups compared to the adult trials with type 1 diabetes. (see Table 5) [See Clinical Studies].

Table 5: Severe Symptomatic Hypoglycemia in Patients with Type 1 Diabetes

  Study A Type 1 Diabetes Adults 28 weeks In combination with regular insulin Study B Type 1 Diabetes Adults 28 weeks In combination with regular insulin Study C Type 1 Diabetes Adults 16 weeks In combination with insulin lispro Study D Type 1 Diabetes Pediatrics 26 weeks In combination with regular insulin
Percent of patients (n/total N) 10.6 (31/292) 15.0 (44/293) 8.7 (23/264) 10.4 (28/270) 6.5 (20/310) 5.2 (16/309) 23.0 (40/174) 28.6 (50/175)

Table 6: Severe Symptomatic Hypoglycemia in Patients with Type 2 Diabetes

  Study E Type 2 Diabetes Adults 52 weeks In combination with oral agents Study F Type 2 Diabetes Adults 28 weeks In combination with regular insulin Study G Type 2 Diabetes Adults 5 years In combination with regular insulin
Percent of patients (n/total N) 1.7 (5/289) 1.1 (3/281) 0.4 (1/259) 2.3 (6/259) 7.8 (40/513) 11.9 (60/504)


Retinopathy was evaluated in the LANTUS clinical studies by analysis of reported retinal adverse events and fundus photography. The numbers of retinal adverse events reported for LANTUS and NPH insulin treatment groups were similar for patients with type 1 and type 2 diabetes.

LANTUS was compared to NPH insulin in a 5-year randomized clinical trial that evaluated the progression of retinopathy as assessed with fundus photography using a grading protocol derived from the Early Treatment Diabetic Retinopathy Scale (ETDRS). Patients had type 2 diabetes (mean age 55 yrs) with no (86%) or mild (14%) retinopathy at baseline. Mean baseline HbA1c was 8.4%. The primary outcome was progression by 3 or more steps on the ETDRS scale at study endpoint. Patients with pre-specified post-baseline eye procedures (pan-retinal photocoagulation for proliferative or severe nonproliferative diabetic retinopathy, local photocoagulation for new vessels, and vitrectomy for diabetic retinopathy) were also considered as 3-step progressors regardless of actual change in ETDRS score from baseline. Retinopathy graders were blinded to treatment group assignment. The results for the primary endpoint are shown in Table 7 for both the per-protocol and Intent-to-Treat populations, and indicate similarity of Lantus to NPH in the progression of diabetic retinopathy as assessed by this outcome.

Table 7: Number (%) of patients with 3 or more step progression on ETDRS scale at endpoint

  Lantus (%) NPH (%) Differencea,b (SE) 95% CI for difference
Per-protocol 53/374 (14.2%) 57/363 (15.7%) -2.0% (2.6%) -7.0% to +3.1%
Intent-to-Treat 63/502 (12.5%) 71/487 (14.6%) - 2.1% (2.1%) -6.3% to +2.1%
a Difference = Lantus - NPH
b using a generalized linear model (SAS GENMOD) with treatment and baseline HbA1c strata (cutoff 9.0%) as the classified independent variables, and with binomial distribution and identity link function

Insulin initiation and intensification of glucose control

Intensification or rapid improvement in glucose control has been associated with a transitory, reversible ophthalmologic refraction disorder, worsening of diabetic retinopathy, and acute painful peripheral neuropathy. However, long-term glycemic control decreases the risk of diabetic retinopathy and neuropathy.


Long-term use of insulin, including LANTUS, can cause lipodystrophy at the site of repeated insulin injections. Lipodystrophy includes lipohypertrophy (thickening of adipose tissue) and lipoatrophy (thinning of adipose tissue), and may affect insulin absorption. Rotate insulin injection or infusion sites within the same region to reduce the risk of lipodystrophy. [See DOSAGE AND ADMINISTRATION].

Weight gain

Weight gain can occur with insulin therapy, including LANTUS, and has been attributed to the anabolic effects of insulin and the decrease in glucosuria.

Peripheral Edema

Insulin, including LANTUS, may cause sodium retention and edema, particularly if previously poor metabolic control is improved by intensified insulin therapy.

Allergic Reactions

Local Allergy

As with any insulin therapy, patients taking LANTUS may experience injection site reactions, including redness, pain, itching, urticaria, edema, and inflammation. In clinical studies in adult patients, there was a higher incidence of treatment-emergent injection site pain in LANTUS-treated patients (2.7%) compared to NPH insulin-treated patients (0.7%). The reports of pain at the injection site did not result in discontinuation of therapy.

Rotation of the injection site within a given area from one injection to the next may help to reduce or prevent these reactions. In some instances, these reactions may be related to factors other than insulin, such as irritants in a skin cleansing agent or poor injection technique. Most minor reactions to insulin usually resolve in a few days to a few weeks.

Systemic Allergy

Severe, life-threatening, generalized allergy, including anaphylaxis, generalized skin reactions, angioedema, bronchospasm, hypotension, and shock may occur with any insulin, including LANTUS and may be life threatening.

Antibody production

All insulin products can elicit the formation of insulin antibodies. The presence of such insulin antibodies may increase or decrease the efficacy of insulin and may require adjustment of the insulin dose. In phase 3 clinical trials of LANTUS, increases in titers of antibodies to insulin were observed in NPH insulin and insulin glargine treatment groups with similar incidences.

Postmarketing experience

The following adverse reactions have been identified during post-approval use of LANTUS. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate reliably their frequency or establish a causal relationship to drug exposure.

Medication errors have been reported in which other insulins, particularly short-acting insulins, have been accidentally administered instead of LANTUS [See PATIENT INFORMATION]. To avoid medication errors between LANTUS and other insulins, patients should be instructed to always verify the insulin label before each injection.

Read the entire FDA prescribing information for Lantus (Insulin Glargine [rDNA origin] Injection) »


Lantus - User Reviews

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