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Drug reference

Insulin lispro

Humalog · Admelog · Lyumjev (insulin lispro-aabc)

Rapid-acting mealtime insulin with product-specific meal timing, concentration, pump, IV and dilution rules. This reference covers standalone Humalog/Admelog and separately identifies Lyumjev insulin lispro-aabc.

Therapeutic class
Rapid-acting insulin analog
Representative product
Humalog KwikPen · U-100
Reference focus
Mealtime injection · selected U-100 pump/IV use
Essential safety

Verify the product, concentration and meal timing.

U-200 is for subcutaneous pen use only: never transfer it to a syringe, pump or IV line. Pens display actual units without conversion. Severe hypoglycemia needs emergency treatment; pump failure can rapidly cause hyperglycemia/ketoacidosis.

Warnings and precautions
01

Indications

Selected products improve glycemic control in adults and pediatric patients with diabetes.

Labeled indications and pediatric evidence

Humalog, Admelog and Lyumjev have adult/pediatric diabetes indication wording. Humalog and Admelog pediatric support includes type 1 diabetes ages ≥ 3 plus adult studies; Lyumjev pediatric support includes type 1 ages ≥ 1 plus adult/pediatric evidence. These are product-specific evidence ages, not one interchangeable minimum-age statement for the class.

Clinical role and scope

Subcutaneous injections generally accompany intermediate/long-acting insulin; pump delivery supplies basal and bolus insulin using its programmed regimen. No fixed basal-insulin starting algorithm or universal units/kg prescription is supplied. Protamine premixes (Humalog Mix75/25/Mix50/50), other brands and individualized DKA/critical-care protocols are outside this standalone-product reference.

02

Dosage and administration

Dose is individualized to glucose, meals, activity and the delivery regimen.

Subcutaneous meal timing and switching

Inject in abdomen, thigh, upper arm or buttocks; rotate healthy sites and avoid thickened/depressed or amyloid areas. Adjust units using the prescribed mealtime/correction plan, glucose results and clinical circumstances.

ProductTiming / switching
Humalog U-100 or U-200Within 15 minutes before a meal or immediately after. A different dose may be needed when switching other insulins.
Admelog U-100Within 15 minutes before a meal or immediately after. Its label uses the same dose when switching another insulin lispro product; reassess under supervision.
Lyumjev U-100 or U-200At meal start or within 20 minutes after starting. Another mealtime insulin can initially change unit-for-unit, with monitoring/titration.
Pen dosingNo concentration conversion: window displays units. Lilly standard KwikPen/Tempo/U-200 pens deliver up to 60 units/injection in1-unit steps; Junior U-100 pens up to 30 in0.5-unit steps. Admelog SoloStar uses1-unit steps.

U-100 pump and IV administration

Use only a pump whose instructions permit the exact product. U-200 must never be given by pump or IV. Pump users need training and an injectable backup plan.

ProductPump / IV label instructions
Humalog U-100Reservoir change at least every 7 days or sooner per pump manual; do not mix/dilute. IV dilute to 0.1–1 unit/mL with 0.9% sodium chloride.
Admelog U-100Reservoir change at least every 7 days or sooner per pump manual; do not mix/dilute. IV dilute to 0.1–1 unit/mL with 0.9% sodium chloride.
Lyumjev U-100Reservoir change at least every 9 days or sooner per pump manual; do not mix/dilute. IV dilute to 1 unit/mL with 0.9% sodium chloride or 5% dextrose; lower concentrations are not recommended.
  • Change infusion set/site per the pump manufacturer; replace insulin exposed above37°C. Reservoir maximum is not an infusion-set replacement schedule.
  • IV use is only under medical supervision with close glucose and potassium monitoring; dose/rate follows the supervised protocol.

Mixing and supervised subcutaneous dilution

Humalog U-100 may be mixed ONLY with NPH for injection: draw lispro first and inject immediately. Do not mix Humalog U-200, Admelog or Lyumjev with another insulin. Medical-supervised SC dilution differs: Humalog U-100 uses its Sterile Diluent to U-10 or U-50; current Admelog labeling permits equal parts U-100 and sterile0.9% sodium chloride to U-50. Lyumjev has no SC dilution regimen here. Never apply a dilution rule to a pen, pump or different product.

Organ impairment and changing requirements

Renal/hepatic impairment increases hypoglycemia risk and may require more frequent adjustment/glucose monitoring, without a fixed eGFR-based formula. Meal/activity changes, acute illness, medicines and switching sites/brands can alter needs. For forgotten Lyumjev mealtime dosing, its label instructs glucose assessment to decide whether a dose is needed and resumption of usual schedule next meal; do not automatically double doses.

03

Safety

Hypoglycemia and concentration/device errors are central risks.

Warnings and precautions

  • Severe hypoglycemia can cause seizure, unconsciousness or death. Meals/activity, kidney/liver impairment and medicines alter risk; impaired warning awareness requires closer monitoring.
  • Never share pens, cartridges, syringes or needles, even with a changed needle. Check exact product/concentration before every dose. Never withdraw U-200 from a pen into a syringe.
  • Change strength/brand/site/delivery method only with supervision and more checks. Moving from abnormal repeatedly used sites to healthy tissue can cause hypoglycemia.
  • Pump/set malfunction or degraded insulin can rapidly cause hyperglycemia and ketoacidosis. Promptly identify/correct faults and use the prescribed injectable backup plan.
  • Insulin can lower potassium; monitor at-risk patients and all supervised IV regimens. Severe hypokalemia can cause arrhythmia or paralysis.
  • Anaphylaxis requires stopping the product and emergency treatment. TZD co-treatment can worsen fluid retention/HF.
  • Lyumjev injection/infusion-site reactions are more frequent with pump use and in pediatric patients; persistent reactions require an alternative insulin.

Contraindications

Do not administer during hypoglycemia or with hypersensitivity to insulin lispro/the exact Humalog or Admelog ingredients, or insulin lispro-aabc/the exact Lyumjev ingredients.

Boxed warning status

No boxed warning appears in these selected labels. Severe hypoglycemia, medication errors, anaphylaxis, hypokalemia and pump-related ketoacidosis remain serious labeled risks.

Adverse reactions and overdose

Hypoglycemia, weight gain, edema, local reactions, lipodystrophy/cutaneous amyloidosis and antibodies are reported. Site reactions differ across products/routes; trial rates should not be pooled. Excess insulin causes potentially recurrent hypoglycemia and hypokalemia. Treat a mild low with oral glucose when able to swallow; severe neurologic symptoms need emergency glucagon or IV glucose and observation. Do not give food/drink to an unconscious person.

04

Drug interactions

Medicines can change glucose needs or conceal warning symptoms.

Clinically relevant interactions

CombinationAction
Other antidiabetics, ACE inhibitors/ARBs, fluoxetine, salicylates, selected antibioticsLow-glucose risk may rise; review dose and increase checks.
Corticosteroids, estrogen/progestin contraceptives, atypical antipsychotics, thyroid hormones, sympathomimeticsGlucose lowering may decrease; adjust according to results.
Alcohol, beta blockers, clonidine, lithium; pentamidineGlucose response may increase/decrease; pentamidine may cause lows then highs.
Beta blockers, clonidine, guanethidine, reserpineMay blunt hypoglycemia warning symptoms; rely on increased monitoring.
TZDsMonitor fluid retention/HF and review TZD reduction/discontinuation if HF develops.
05

Use in specific populations

Pregnancy and organ dysfunction require ongoing glucose-guided care.

Pregnancy and lactation

Published lispro pregnancy studies do not report an association with major birth defects/miscarriage/adverse outcomes, but methodological limitations prevent exclusion of all risk. Poorly controlled diabetes itself poses substantial maternal/fetal risk. Selected labels report insulin/lispro in milk without reported infant adverse reactions; milk-production effects are unknown. Balance maternal need and breastfeeding, with individualized glucose/dose review.

Pediatric and geriatric considerations

Humalog/Admelog pediatric support includes type 1 age ≥ 3; Lyumjev type 1 age ≥ 1. Product indication wording is broader than those trial ages. Follow specialist meal/monitoring/device education; monitor Lyumjev sites closely, particularly with pediatric pump use. Older adults need careful recognition of lows, functional/device ability and changing comorbidity.

Renal and hepatic impairment

No fixed unit adjustment is supplied. Declining kidney/liver function may reduce requirements and increase lows even when a study shows limited PK change. Increase glucose checks and adjust to clinical response rather than declaring no renal/hepatic effect.

06

Clinical pharmacology

Insulin lowers glucose through uptake and reduced hepatic production.

Mechanism of action

Promotes glucose uptake in muscle/fat and inhibits hepatic glucose production. It also inhibits lipolysis/proteolysis and promotes protein synthesis. Lispro’s absorption is faster than regular human insulin; Lyumjev’s formulation changes early absorption.

Pharmacokinetics and time action

Humalog absorption
SC serum peaks ~30–90 minutes in studied doses; onset/duration vary with site, exercise and dose.
Lyumjev absorption
In studied subjects appears in circulation ~1 minute after injection; peak ~57 minutes. These PK observations are not a dosing/redosing instruction.
Lyumjev effect
Clamp duration was dose-dependent (~4.6–7.3 hours at 7–30 units); no single duration applies to every patient.
Elimination
Humalog SC half-life ~1 hour; Lyumjev median IV half-life44 minutes in studied subjects. Product/route PK must not replace glucose monitoring.
07

Monitoring and counseling

Glucose checks, device training and meal planning prevent avoidable harm.

Monitoring parameters

  • Follow prescribed glucose/CGM plan and clinical glycemic progress; increase checks during regimen, meal/activity, illness or organ-function changes.
  • Review low-glucose events/awareness, meal timing, units, injection/infusion sites and device technique.
  • Monitor potassium for IV therapy or other risks; monitor weight/edema/HF with TZDs.
  • Investigate unexplained hyperglycemia/ketosis promptly, especially with pump faults.

Patient counseling information

  • Read the exact pen/pump instructions, prime as directed, use new needles and remove needles after pen injections. Check product/concentration and prescribed units.
  • Use the product-specific meal window and the prescribed correction plan; never calculate pen doses by concentration or transfer U-200 to a syringe.
  • Never share devices; rotate healthy sites. Carry low-glucose treatment and teach caregivers emergency glucagon.
  • Have an injectable backup for pump failure; discuss illness/missed meals/doses and driving safety with the care team.
08

Product identification

Confirm product, concentration and device before dosing.

Representative injectable product · Humalog U-100 KwikPen

Dosage form / concentration
Clear/colorless solution · 100 units/mL
Presentation
3 mL single-patient pen · 300 units
Manufacturer
Eli Lilly and Company
Example NDC
0002-8799-59 · five pens

Dosage forms and strengths

Humalog U-100: 10/3 mL vials, 3 mL cartridges/KwikPen/Junior/Tempo; U-200: 3 mL KwikPen. Admelog U-100: 10/3 mL vials and 3 mL SoloStar. Lyumjev U-100: 10 mL vial, 3 mL cartridge/KwikPen/Junior/Tempo; U-200: 3 mL KwikPen. U-100 pens/cartridges contain 300 units; U-200 pen contains 600. Verify cartridge compatibility; premixes are separate.

Storage and handling

Unopened: 2–8°C until expiry; do not freeze, use if frozen, or expose to direct heat/light. Selected vials/pens/cartridges have a 28-day room-temperature limit (Humalog/Admelog ≤ 30°C; Lyumjev < 30°C), including unopened time. In-use vials may be refrigerated; in-use pens/cartridges must not be. Write opening/discard dates.

Prepared productSelected label stability
Humalog diluted SC28 days at 5°C or 14 days ≤ 30°C, with its Sterile Diluent.
Admelog diluted SC U-5024 hours at 2–8°C or 4 hours ≤ 30°C.
Humalog IV infusion48 hours at 2–8°C then up to 48 additional hours at room temperature.
Admelog IV infusion24 hours refrigerated or up to 4 hours at room temperature.
Lyumjev IV infusionUp to 4 days refrigerated; same solution up to 12 hours at 20–25°C.
Pump reservoirsHumalog/Admelog ≤ 7 days; Lyumjev ≤ 9 days, or shorter pump instructions; replace after > 37°C exposure.
09

References

Original sources for the clinical and product information.

  1. DailyMed / National Library of MedicineHumalog · U-100 and U-200 insulin lispro

    Full public manufacturer label and patient instructions; SPL version 87, effective 20260616. Product-specific directions reviewed October 1, 2026.

  2. DailyMed / National Library of MedicineAdmelog · U-100 insulin lispro

    Full public manufacturer label and patient instructions; SPL version 14, effective 20250604. Product-specific directions reviewed October 1, 2026.

  3. DailyMed / National Library of MedicineLyumjev · U-100 and U-200 insulin lispro-aabc

    Full public manufacturer label and patient instructions; SPL version 12, effective 20260616. Product-specific directions reviewed October 1, 2026.

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