July 28, 2016
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Side Effects


Observed With HUMALOG U-100

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 with 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 HUMALOG 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 Patients with Type 1 Diabetes Mellitus (adverse events with frequency ≥ 5%)

Events, n (%) Lispro
Regular human insulin
Flu syndrome 28 (34.6) 28 (32.6)
Pharyngitis 27 (33.3) 29 (33.7)
Rhinitis 20 (24.7) 25 (29.1)
Headache 24 (29.6) 19 (22.1)
Pain 16 (19.8) 14 (16.3)
Cough increased 14 (17.3) 15 (17.4)
Infection 11 (13.6) 18 (20.9)
Nausea 5 (6.2) 13 (15.1)
Accidental injury 7 (8.6) 10 (11.6)
Surgical procedure 5 (6.2) 12 (14.0)
Fever 5 (6.2) 10 (11.6)
Abdominal pain 6 (7.4) 7 (8.1)
Asthenia 6 (7.4) 7 (8.1)
Bronchitis 6 (7.4) 6 (7.0)
Diarrhea 7 (8.6) 5 (5.8)
Dysmenorrhea 5 (6.2) 6 (7.0)
Myalgia 6 (7.4) 5 (5.8)
Urinary tract infection 5 (6.2) 4 (4.7)

Table 2: Treatment-Emergent Adverse Events in Patients with Type 2 Diabetes Mellitus (adverse events with frequency ≥ 5%)

Events, n (%) Lispro
Regular human insulin
Headache 63 (11.6) 66 (9.3)
Pain 77 (10.8) 71 (10.0)
Infection 72 (10.1) 54 (7.6)
Pharyngitis 47 (6.6) 58 (8.2)
Rhinitis 58 (8.1) 47 (6.6)
Flu syndrome 44 (6.2) 58 (8.2)
Surgical procedure 53 (7.4) 48 (6.8)

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 HUMALOG, can cause lipodystrophy at the site of repeated insulin injections or infusion. 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 HUMALOG, and has been attributed to the anabolic effects of insulin and the decrease in glucosuria.

Peripheral Edema

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

Adverse Reactions With Continuous Subcutaneous Insulin Infusion (CSII) — HUMALOG U-100

In a 12-week, randomized, crossover study in adult patients with type 1 diabetes (n=39), the rates of catheter occlusions and infusion site reactions were similar for HUMALOG U-100 and regular human insulin treated patients (see Table 3).

Table 3: Catheter Occlusions and Infusion Site Reactions

Regular human insulin
Catheter occlusions/month 0.09 0.10
Infusion site reactions 2.6% (1/38) 2.6% (1/39)

In a randomized, 16-week, open-label, parallel design study of children and adolescents with type 1 diabetes, adverse event reports related to infusion-site reactions were similar for insulin lispro and insulin aspart (21% of 100 patients versus 17% of 198 patients, respectively). In both groups, the most frequently reported infusion site adverse events were infusion site erythema and infusion site reaction.

Allergic Reactions

Local Allergy — As with any insulin therapy, patients taking HUMALOG may experience redness, swelling, or itching at the site of the injection. These minor reactions usually resolve in a few days to a few weeks, but in some occasions, may require discontinuation of HUMALOG. 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.

Systemic Allergy — Severe, life-threatening, generalized allergy, including anaphylaxis, may occur with any insulin, including HUMALOG. Generalized allergy to insulin may cause whole body rash (including pruritus), dyspnea, wheezing, hypotension, tachycardia, or diaphoresis.

In controlled clinical trials, pruritus (with or without rash) was seen in 17 patients receiving regular human insulin (n=2969) and 30 patients receiving HUMALOG (n=2944).

Localized reactions and generalized myalgias have been reported with injected metacresol, which is an excipient in HUMALOG [see CONTRAINDICATIONS].

Antibody Production

In large clinical trials with patients with type 1 (n=509) and type 2 (n=262) diabetes mellitus, anti-insulin antibody (insulin lispro-specific antibodies, insulin-specific antibodies, cross-reactive antibodies) formation was evaluated in patients receiving both regular human insulin and HUMALOG (including patients previously treated with human insulin and naive patients). As expected, the largest increase in the antibody levels occurred in patients new to insulin therapy. The antibody levels peaked by 12 months and declined over the remaining years of the study. These antibodies do not appear to cause deterioration in glycemic control or necessitate an increase in insulin dose. There was no statistically significant relationship between the change in the total daily insulin dose and the change in percent antibody binding for any of the antibody types.

Postmarketing Experience


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

Medication errors in which other insulins have been accidentally substituted for HUMALOG have been identified during postapproval use [see PATIENT INFORMATION].

Read the Humalog (insulin lispro (human analog)) Side Effects Center for a complete guide to possible side effects


Drugs That May Increase The Risk Of Hypoglycemia

The risk of hypoglycemia associated with HUMALOG use may be increased when co-administered with antidiabetic agents, salicylates, sulfonamide antibiotics, monoamine oxidase inhibitors, fluoxetine, pramlintide, disopyramide, fibrates, propoxyphene, pentoxifylline, ACE inhibitors, angiotensin II receptor blocking agents, and somatostatin analogs (e.g., octreotide). Dose adjustment and increased frequency of glucose monitoring may be required when HUMALOG is co-administered with these drugs.

Drugs That May Decrease The Blood Glucose Lowering Effect Of HUMALOG

The glucose lowering effect of HUMALOG may be decreased when co-administered with corticosteroids, isoniazid, niacin, estrogens, oral contraceptives, phenothiazines, danazol, diuretics, sympathomimetic agents (e.g., epinephrine, albuterol, terbutaline), somatropin, atypical antipsychotics, glucagon, protease inhibitors, and thyroid hormones. Dose adjustment and increased frequency of glucose monitoring may be required when HUMALOG is co-administered with these drugs.

Drugs That May Increase Or Decrease The Blood Glucose Lowering Effect Of HUMALOG

The glucose lowering effect of HUMALOG may be increased or decreased with co-administered with betablockers, clonidine, lithium salts, and alcohol. Pentamidine may cause hypoglycemia, which may sometimes be followed by hyperglycemia. Dose adjustment and increased frequency of glucose monitoring may be required when HUMALOG is co-administered with these drugs.

Drugs That May Blunt Signs And Symptoms Of Hypoglycemia

The signs and symptoms of hypoglycemia [see WARNINGS AND PRECAUTIONS] may be blunted when betablockers, clonidine, guanethidine, and reserpine are co-administered with HUMALOG.

Read the Humalog Drug Interactions Center for a complete guide to possible interactions

This monograph has been modified to include the generic and brand name in many instances.

Last reviewed on RxList: 5/17/2016

Side Effects

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