Lantus Side Effects
Generic Name: insulin glargine
Note: This document contains side effect information about insulin glargine. Some of the dosage forms listed on this page may not apply to the brand name Lantus.
Some side effects of Lantus may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.
For the Consumer
Applies to insulin glargine: subcutaneous solution
Along with its needed effects, insulin glargine (the active ingredient contained in Lantus) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking insulin glargine:More common
- Convulsions (seizures)
Check with your doctor as soon as possible if any of the following side effects occur while taking insulin glargine:More common
- Low blood sugar, including anxious feeling; behavior change similar to being drunk; blurred vision; cold sweats; confusion; cool, pale skin; difficulty in thinking; dizziness or lightheadedness; drowsiness; excessive hunger; fast heartbeat; headache; nausea; nervousness; nightmares; restless sleep; shakiness; slurred speech; and tingling in the hands, feet, lips, or tongue
- Allergic reaction, including fast pulse, shortness of breath, skin rash or itching over the entire body, sweating, and wheezing
Some side effects of insulin glargine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:Less common or rare
- Bloating or swelling of face, hands, lower legs, and/or feet
- depression of skin at injection site
- injection site pain
- local allergy, including itching, redness, or swelling at injection site
- thickening of skin at injection site
For Healthcare Professionals
Applies to insulin glargine: subcutaneous solution
Cardiovascular side effects have included hyperinsulinemia. Given the high frequency of both microvascular and macrovascular diseases in patients with diabetes, some experts are evaluating insulin as a possible atherogenic agent. Controversy and continued study surround the role of hyperinsulinemia as the precursor of hypertension.
Other cardiovascular risk factors that are accentuated in persons with carbohydrate intolerance and hypertension include abnormalities in platelet function, clotting factors, the fibrinolytic system, and dyslipidemia. The relationship between diabetes, insulin, and these disorders is currently under investigation.
Insulin may contribute to the pathogenesis of hypertension by stimulating the sympathetic nervous system, promoting renal sodium retention, and/or stimulating vascular smooth muscle hypertrophy. It may induce dyslipidemia by promoting hepatic synthesis of very low density lipoproteins (VLDLs).
Insulin may stimulate heart rate in the absence of hypoglycemia.
Dermatologic side effects have included lipohypertrophy (insulin is lipogenic) and lipoatrophy (probably immunologically-mediated). The incidence of lipoatrophy has been markedly decreased with the use of purer forms of pork insulin or biosynthetic human insulin and when injection sites were alternated. Without proper hygiene, subcutaneous insulin injections have been complicated by infection.
Endocrine side effects have included hypoglycemia, which has been the most common and serious side effect of insulin, occurring in approximately 16% of type 1 and 10% of type II diabetic patients (the incidence varies greatly depending on the populations studied, types of insulin therapy, etc). Although there are counterregulatory endocrinologic responses to hypoglycemia, some responses have been decreased, inefficient, or absent in some patients. Severe hypoglycemia has usually presented first as confusion, sweating, or tachycardia, and has resulted in coma, seizures, cardiac arrhythmias, neurological deficits, and death. Blood or urine glucose monitoring is recommended in patients who are at risk of hypoglycemia or who do not recognize the signs and symptoms of hypoglycemia. The risk for developing hypoglycemia has been higher in patients receiving intensive or continuous infusion insulin therapy. The association between insulin and dyslipidemia is currently being evaluated.
Permanent neuropsychological impairment has been associated with recurrent episodes of severe hypoglycemia.
In one retrospective study of 600 randomly selected patients with insulin-treated diabetes mellitus, the only reliable predictors of severe hypoglycemia were a history of hypoglycemia, a history of hypoglycemia-related injury or convulsion, and the duration of insulin therapy. Those with a history of hypoglycemia had been treated with insulin for 17.4 years, which was significantly longer than the 14.3 years in the insulin-treated patients without a history of hypoglycemia.
Human insulin does not appear to be associated with hypoglycemic episodes more often than animal insulin. Caution is recommended when switching from animal (either bovine or pork) to purified porcine insulin or biosynthetic human insulin, however, because of increased potency or bioavailability.
Gastrointestinal side effects have been reported rarely. GI distress has tended to resolve with dose reduction.
Intensive insulin therapy causes an increase in body fat as a result of the elimination of glycosuria and reduction in 24-hour energy expenditure. The reduction in 24-h energy expenditure is the result of an insulin-associated decrease in triglyceride/free fatty acid cycling and nonoxidative glucose and protein metabolism.
General side effects have included weight gain, which sometimes presented as edema associated with abrupt restoration of glucose control in a patient whose control was previously poor. Weight gain may have been due to more efficient use of calories during insulin therapy, suggesting additional benefits of dietary and exercise modifications. Patients on intensive insulin therapy have been more likely to experience weight gain.
The effects of insulin-induced hypoglycemia on hemostasis may explain some of the clinical observations of embolic phenomenon during treatment of diabetic ketoacidosis.
Limited data show that diabetics have a significantly lower basal concentration of tissue plasminogen activator.
Hematologic side effects have included increased concentration of von Willebrand factor due to insulin-induced hypoglycemia . Increased von Willebrand factor, combined with hypoglycemia-associated decreased plasma volume and increased plasma viscosity, has predisposed patients to reduced peripheral perfusion or embolic phenomenon. A single case of insulin-induced hemolytic anemia has been reported.
Hypersensitivity side effects have included both local and systemic reactions. These reactions have become rare (less than 1% of patients) due to the use of purer forms of pork insulin or biosynthetic human insulin. Local reactions have presented as erythema, swelling, heat, or subcutaneous nodules. They usually occurred within the first two weeks of therapy, then disappeared. True allergy to insulin has been rare, and sensitization was usually associated with specific animal proteins in bovine and less pure forms of porcine insulins.
A diabetic patient with true allergy to insulin can undergo desensitization. Desensitization kits and protocols are available from some insulin manufacturers.
Immunologic analysis of anaphylaxis to some insulin preparations in some cases has revealed markedly elevated serum levels of lgE and lgG to protamine, but not to regular insulin.
Immunologic side effects have included the formation of anti-insulin antibodies, particularly when animal insulin formulations were used. The presence of these antibodies caused the elimination half-life of insulin to increase.
Rare cases of hypophosphatemia have been associated with the use of glucose, insulin, and potassium infusions during the treatment of myocardial infarction.
Metabolic side effects have included reports of hypokalemia and hypomagnesemia, particularly in patients treated for diabetic ketoacidosis (DKA). Insulin increases the intracellular transport of phosphate, which has often resulted in hypophosphatemia during treatment of DKA.
Ocular side effects have included reports of bilateral presyopia (blurry vision). This was thought to be due to changes in the osmotic equilibrium between the lens and the ocular fluids and was usually self-limited.
Renal side effects have included significantly decreased renal plasma flow, glomerular filtration rate, and significantly increased urinary albumin excretion rate resulting from insulin-induced hypoglycemia These changes were usually reversible upon resolution of hypoglycemia.
Hypoglycemia is associated with increased plasma dopamine, epinephrine, and plasma renin activity. Acute changes in renal function during insulin-induced hypoglycemia, therefore, may result from direct stimulation of the efferent sympathetic nerves to the kidney and hormonal counterregulatory mechanisms.
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