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Insulin Lispro Vial — prescription drug image

Insulin Lispro

Insulin Lispro 10ML of 100UNIT/ML

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What is Insulin Lispro?

Insulin Lispro is a medication used to help manage blood sugar levels in people with type 1 and type 2 diabetes. It works by replacing insulin that the body normally produces and helps move sugar from the blood into the body's tissues for energy.

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What is Insulin Lispro ?

Insulin Lispro is a medication used to help manage blood sugar levels in people with type 1 and type 2 diabetes. It works by replacing insulin that the body normally produces and helps move sugar from the blood into the body's tissues for energy.

Source: MedlinePlus, U.S. National Library of Medicine

  • Rapid weight gain, swelling in your hands, ankles, or feet, trouble breathing, tiredness
  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Blurred vision, change in how much or how often you urinate, fruit-like breath odor, stomach pain, weakness
  • Shaking, trembling, sweating, fast or pounding heartbeat, lightheadedness, hunger, confusion
  • Dry mouth, increased thirst, muscle cramps, nausea or vomiting, uneven heartbeat
  • Tell your doctor if you are pregnant or breastfeeding, or if you have kidney disease, liver disease, heart disease, or heart failure.
  • This medicine may cause the following problems:Low blood sugar or low potassium levels in the bloodFluid retention or heart failure (when used together with a thiazolidinedione [TZD] medicine)
  • This medicine may make you dizzy or drowsy. Do not drive or do anything else that could be dangerous until you know how this medicine affects you.
  • Never share insulin pens, cartridges, or needles with anyone. Sharing these can pass hepatitis viruses, HIV, and other illnesses from one person to another.
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.
  • Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.
Is insulin lispro the same as Humalog?
Yes. Humalog is a brand name for insulin lispro from Lilly, and insulin lispro is the active ingredient. Lilly also sells an unbranded, authorized-generic "Insulin Lispro Injection" that contains the same insulin as Humalog. Admelog is Sanofi's insulin lispro brand, approved as a follow-on product. Lyumjev is insulin lispro-aabc, an ultra-rapid version. They are all insulin lispro products, but they are not automatically swapped at the pharmacy, so fill what your prescriber wrote unless they approve a change.
How long does insulin lispro take to start working?
Insulin lispro starts working in about 15 minutes, reaches its peak effect around 1 hour, and lasts about 2 to 4 hours. That fast onset is why it is used as a mealtime insulin and is taken close to eating. Follow the timing your prescriber gives you, and be sure you will actually eat, since taking it and then skipping the meal raises the risk of low blood sugar.
How much does insulin lispro cost without insurance?
There is no single cash price. What you pay depends on the pharmacy, your ZIP code, the exact product (vial, KwikPen, premixed pen), and whether you get a brand such as Humalog or Admelog or Lilly's unbranded Insulin Lispro Injection. Prices for the same product vary widely from pharmacy to pharmacy, which is why comparing is worth the two minutes. Enter your ZIP above to see today's price at pharmacies near you with a free Rx.com coupon. Lilly and other insulin makers also run their own savings programs on their official websites; eligibility and terms vary, and manufacturer offers usually cannot be combined with a cash coupon, so compare and use whichever is cheaper for you.
Can you switch between insulin lispro and insulin aspart (NovoLog)?
Only with your prescriber's direction. Insulin lispro and insulin aspart are both rapid-acting mealtime insulins with similar timing, but they are separate products and are not interchangeable at the pharmacy counter. Any change between insulin products can change your blood sugar control and may require a dose adjustment and closer monitoring. Mix-ups between insulin products are a known cause of dangerous dosing errors, so always check the label before each injection.
How should insulin lispro be stored, and how long is a pen good for after opening?
Store unopened pens and vials in the refrigerator, and do not freeze them or use insulin that has been frozen. Keep insulin away from heat and direct light. Once a pen or vial is in use, it is kept at room temperature for a limited number of days; for Humalog pens the labeling allows up to 28 days of room-temperature use after first use. The exact limit differs by product and by device (vial, pen, cartridge, or pump reservoir), so check the Instructions for Use that came with your specific insulin, or ask your pharmacist. Throw out insulin that is past its in-use limit, and never share a pen, cartridge, or syringe with anyone else.
How much does Insulin Lispro cost without insurance?
The price of Insulin Lispro without insurance varies by pharmacy, dosage, and quantity. Rx.com compares cash prices at more than 60,000 US pharmacies so you can find the lowest price near you.
What are the common side effects of Insulin Lispro?
Common side effects of Insulin Lispro may include: Rapid weight gain, swelling in your hands, ankles, or feet, trouble breathing, tiredness, Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing, Blurred vision, change in how much or how often you urinate, fruit-like breath odor, stomach pain, weakness, Shaking, trembling, sweating, fast or pounding heartbeat, lightheadedness, hunger, confusion, Dry mouth, increased thirst, muscle cramps, nausea or vomiting, uneven heartbeat. This is not a complete list — consult your pharmacist or doctor for full side effect information.
Is there a generic version of Insulin Lispro?
Generic versions may be available for Insulin Lispro. Generics contain the same active ingredients as brand-name drugs and are typically 80–90% cheaper. Search Insulin Lispro on Rx.com to compare generic and brand prices at pharmacies near you.
What is the cheapest pharmacy for Insulin Lispro?
The cheapest pharmacy for Insulin Lispro depends on your location and dosage. Rx.com compares prices at CVS, Walgreens, Walmart, Kroger, Costco, and thousands of independent pharmacies. Enter your ZIP code on Rx.com to find the lowest price for Insulin Lispro near you.

Insulin Lispro Coupons & Prices

Insulin Lispro 10ML of 100UNIT/ML

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Insulin Lispro Vial — prescription drug image
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An insulin lispro coupon from Rx.com can lower what you pay at the pharmacy counter when you are paying cash, using a high-deductible plan, or your insurance does not cover the insulin your doctor prescribed. Insulin lispro is the rapid-acting mealtime insulin sold under the brand names Humalog and Admelog, and also sold by Lilly as an unbranded, authorized-generic "Insulin Lispro Injection." Cash prices for the same pen or vial can differ a lot from one pharmacy to the next, even across the street, so it pays to compare before you fill. Enter your ZIP code above to see today's price at pharmacies near you, then show the free coupon at the counter.

What is insulin lispro and how does it work?

Insulin lispro is a rapid-acting human insulin analog. It works the same way your body's own insulin does, by acting on the insulin receptor to move sugar out of the blood and into your cells. It is FDA-approved to improve blood sugar control in adults and children with diabetes mellitus, both type 1 and type 2. It is given under the skin by syringe, pen, or an insulin pump (continuous subcutaneous insulin infusion), and it can be given into a vein under medical supervision in a hospital.

Because it works quickly, insulin lispro is used as a mealtime (bolus) insulin. It starts working in about 15 minutes, peaks around 1 hour, and wears off in about 2 to 4 hours, so it is usually taken close to a meal. Premixed forms such as Humalog Mix75/25 and Mix50/50 combine rapid mealtime coverage with longer background coverage in one pen. Many people also take a separate long-acting basal insulin, such as insulin glargine or Tresiba, alongside it. Insulin lispro is not a controlled substance.

Insulin lispro cost without insurance and how to save

Insulin lispro is one of the drugs where shopping around matters most. The same box of pens can carry very different cash prices depending on which pharmacy you walk into, and the retail sticker price is rarely the price you have to pay. Rx.com compares cash prices at participating pharmacies nationwide and gives you a free coupon to use at the counter, with no membership or sign-up. Enter your ZIP above to see today's price near you before you fill.

A few honest points about paying without insurance:

  • There is an unbranded version of Humalog. Lilly sells an unbranded, authorized-generic "Insulin Lispro Injection" that contains the same insulin as Humalog. What you actually pay for it still varies by pharmacy, so ask your pharmacist which version they stock and price both. Admelog is a separate follow-on insulin lispro brand from Sanofi; ask whether your pharmacy carries it and what it would cost you.
  • Manufacturer help exists. Lilly runs an insulin savings program on its official insulin website, and Sanofi and other insulin makers run their own programs. Eligibility and terms vary, and cash-pay coupons generally cannot be combined with a manufacturer offer, so compare the two and use whichever is lower for you.
  • Formulations are priced differently. Vials, KwikPens, Junior KwikPens, and premixed pens can all price out differently. If your prescription allows it, ask your prescriber whether a different device or a different lispro product would work for you.
  • Do not stretch or skip doses to save money. If cost is a barrier, tell your prescriber or pharmacist. Rationing insulin is dangerous.

Insulin lispro vs. other insulins

Insulin lispro is one of several rapid-acting mealtime insulins. Insulin aspart (sold as NovoLog) is a close cousin with a similar rapid onset. Lyumjev (insulin lispro-aabc) is an ultra-rapid formulation of lispro from the same manufacturer. Admelog is Sanofi's insulin lispro brand, approved as a follow-on product rather than as an interchangeable substitute for Humalog. These products are not automatically interchangeable at the pharmacy, and units are not always swapped one-for-one, so any change should be made by your prescriber with a plan for extra blood sugar monitoring.

Mealtime insulin is different from basal (background) insulin. Long-acting options such as Lantus, Basaglar, and Tresiba cover you between meals and overnight rather than at the meal itself. For many people with type 2 diabetes, oral medicines such as metformin are used along with or before insulin. Which combination is right for you is a decision for your care team, not something to change on your own.

Safety, side effects, and warnings

Insulin lispro has no boxed warning. The most common and most serious side effect is low blood sugar (hypoglycemia), which can be life-threatening and can cause seizures or loss of consciousness. Risk goes up with dosing errors, missed meals, alcohol, more exercise than usual, and mix-ups between insulin products, so always read the label on the pen or vial before every injection. It should not be used during an episode of low blood sugar, or by anyone with a hypersensitivity to insulin lispro. Beta-blockers, clonidine, and guanethidine can hide the warning signs of low blood sugar.

Other important points: never share a pen, cartridge, or syringe with another person, even with a new needle, because of the risk of passing blood-borne infections. Never draw insulin out of a pen or cartridge into a syringe, which can cause a serious overdose with the U-200 concentration; Humalog U-200 should not be diluted or mixed. Low potassium can occur and, if severe, can cause breathing problems or heart rhythm problems, so potassium may be monitored in people at risk. Taking a thiazolidinedione (pioglitazone or rosiglitazone) with insulin can cause fluid retention and heart failure. Severe allergic reactions, including anaphylaxis, are possible. Weight gain, swelling in the hands or feet, injection-site reactions, and skin changes such as lipodystrophy can occur, so rotate your injection sites. Insulin needs change with illness, kidney or liver problems, and pregnancy, and your dose may need to be adjusted. This page is general information, not medical advice; talk with your doctor or pharmacist about your own situation.

Sources & accuracy

This Insulin Lispro information was written and reviewed against authoritative U.S. medical sources — MedlinePlus (U.S. National Library of Medicine), DailyMed, and FDA prescribing information — and checked for accuracy. It is provided for education and is not a substitute for professional medical advice.

Verify the official label: Insulin Lispro on DailyMed (FDA)

Reviewed against FDA labeling · Last reviewed July 2026

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Medical disclaimer: This information is provided for general educational purposes only and is not medical advice. It is not a substitute for professional diagnosis or treatment. Always consult a licensed physician, pharmacist, or other qualified healthcare provider before starting, stopping, or changing any medication or treatment. Never disregard professional medical advice or delay seeking it because of something you read here. If you think you may have a medical emergency, call your doctor or 911 immediately.


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