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Nucala Coupon - Nucala 100mg/ml autoinjector

Nucala

mepolizumab
Used for Asthma

Nucala (mepolizumab) is an injection that treats certain inflammatory problems. This includes severe asthma in people 6 years and older. It can also treat chronic obstructive pulmonary disease (COPD) and sinus congestion with nasal polyps in adults. The medication works as an interleukin antagonist to lower inflammation. It's injected under the skin once a month. You can inject it on your own with the prefilled autoinjector or syringe. A healthcare professional can also give the injection at a medical office. Side effects include headache and injection site reactions.

Reviewed by:Last reviewed on May 23, 2025
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What is Nucala (mepolizumab)?

What is Nucala (mepolizumab) used for?

How Nucala (mepolizumab) works

Nucala (mepolizumab) is an interleukin antagonist. It blocks a protein in the body called interleukin-5 (IL-5). These proteins help make immune cells called eosinophils, which cause inflammation in the body.

By blocking IL-5, Nucala (mepolizumab) lowers the eosinophil levels in the body. This helps lower inflammation and relieve symptoms from certain inflammatory problems.

When does Nucala (mepolizumab) start working?Time passed since treatment started:
HOURS
DAYS
WEEKS
MONTHS
Full effect

Drug facts

Common Brands
Drug ClassInterleukin antagonist
Controlled Substance ClassificationNot a controlled medication
Generic StatusNo lower-cost generic available
AvailabilityPrescription only
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Side effects of Nucala (mepolizumab)

The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.

Common Side Effects

  • Headache (19%)
  • Injection site reactions (e.g., pain, redness, swelling, itching, burning; 8%)
  • Back pain (5%)
  • Fatigue (5%)

Less Common Side Effects

Note: Side effects listed were reported by people with severe asthma. Side effects might slightly differ for people with other conditions.

Nucala (mepolizumab) serious side effects

Contact your healthcare provider immediately if you experience any of the following.

  • Allergic reactions: hives; wheezing; trouble breathing; swelling of face, mouth, tongue, or throat
When do Nucala (mepolizumab) possible side effects begin and end?
Time passed since treatment started:
H
D
W
M
Injection site reaction

Source: Prescribing information

The following Nucala (mepolizumab) side effects have also been reported

Side effects that you should report to your care team as soon as possible:

Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome):

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Pros and cons of Nucala (mepolizumab)

Pros

  • Only given once a month
  • Available as a prefilled autoinjector and syringe for injections at home

Cons

  • Must give as an injection
  • Doses higher than 100 mg need more than one injection given one after another
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Pharmacist tips for Nucala (mepolizumab)

pharmacist
  • Inject Nucala (mepolizumab) once every 4 weeks, or once a month. Mark your calendar or set up reminders on your phone for your injections to help you remember.
  • If you miss a dose of Nucala (mepolizumab), inject the medication as soon as you remember. Then, keep following your usual dosing schedule. If it's already time for your next injection, just take the medication like you normally would.
  • The spot where you inject Nucala (mepolizumab) might feel sore, red, swollen, or itchy a few hours later. These reactions usually go away on their own in 1 or 2 days. In the meantime, you can use warm or cold compresses or over-the-counter pain relievers to help. But if they get worse or don't go away, tell your care team.
  • Don't stop or lower the dose of any steroid medications you take without talking to your care team, even if you feel better with Nucala (mepolizumab). It could make your symptoms worse or cause steroid withdrawal. This can be very uncomfortable. Your prescriber will tell you how to safely lower your dose.

Tips for using Nucala (mepolizumab) at home

  • Your care team will show you how to use and inject Nucala (mepolizumab) before you can do it on your own. Review the instructions for use for the prefilled autoinjector or the prefilled syringe. Ask your prescriber or pharmacist if you have any questions about how to inject the medication.
  • How to store Nucala (mepolizumab): Keep the medication in the refrigerator until it's time your injection, but don't let it freeze. Keep it in the original carton to protect it from light. If you're traveling or don't have access to a fridge, you can keep unopened cartons at temperatures up to 86ºF for up to 7 days. After that, you'll need to throw it away in a sharps container.
  • Before each Nucala (mepolizumab) injection: Take a carton out of the refrigerator and then take out the tray from the carton. Let it sit on a flat surface to warm up. Don't use other ways to warm it. Wait about 30 minutes for the medication to reach room temperature before injecting. Once out of the carton, use the medication within 8 hours or you'll have to throw it away.
  • Where to inject Nucala (mepolizumab): Inject under the skin of your thigh or lower stomach (at least 2 inches away from your belly button). Someone can also help you inject it under the skin at the back of the upper arms. Leave at least 2 inches between each spot if you need more than one injection for doses over 100 mg. Don't inject into skin that's bruised, tender, red, or hard to avoid pain or skin irritation.
  • When you're ready to inject Nucala (mepolizumab): Take off the needle cap. Inject within 5 minutes. This makes sure the medication doesn't dry in the needle and you get your full dose.
  • How to inject using the Nucala prefilled autoinjector: 1) Place the yellow needle guard flat against your skin at a 90-degree angle. 2) Press down and hold it there for the entire injection (takes about 15 seconds). 3) When the injection starts, you'll hear a click and see the inspection window start to turn yellow. 4) After the second click and the window is fully yellow, count to 5 and then lift the autoinjector up.
  • How to inject using the Nucala prefilled syringe: 1) Pinch the skin with one hand. 2) With the other hand, insert the entire needle into the pinched skin at a 45-degree angle. 3) Slowly push the white plunger down until all the medication gets injected. 4) Slowly let go of the plunger. The needle will go into the syringe by itself. 5) Let go of your pinched skin when the injection is done.
  • After each Nucala (mepolizumab) injection: Throw your used syringes and autoinjectors away in a sharps container or a heavy-duty plastic container, like an empty milk carton or laundry detergent bottle. Don't throw them away in your trash can. This helps prevent everyone from getting hurt from needle sticks.
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Common questions about Nucala (mepolizumab)

Nucala (mepolizumab) helps manage different inflammatory conditions, but it doesn't cure them. Your prescriber will usually have you keep taking Nucala (mepolizumab) as long as it helps you and you don't have serious side effects. Ask your prescriber if you're not sure how long you need to take Nucala (mepolizumab).

Some people might think of Nucala (mepolizumab) as an immunosuppressant. It blocks a protein called interleukin-5. This helps lower the amount of eosinophils in your body. Eosinophils not only cause inflammation but also help your body fight infections. When Nucala (mepolizumab) helps lower eosinophil levels, it helps reduce inflammation. But it might weaken your immune system at the same time. This might affect how well your body can fight off some infections, like herpes zoster (shingles).

It can take about 2 to 4 months for most of Nucala (mepolizumab) to leave your body after a single dose. This is estimated from the medication's half-life of Nucala (mepolizumab). But even though the medication can stay in the body for a long time, you should still inject it every 4 weeks (once a month). This helps keep the medication levels stable in the body it can work well to help with your symptoms.

If you stop taking Nucala (mepolizumab), it can raise the risk that your symptoms can come back or get worse. Nucala (mepolizumab) is a medication you take long term to help with symptoms from certain inflammatory conditions, like severe asthma or COPD. Talk to your prescriber if you want to stop Nucala (mepolizumab). They can help you decide if it's the right choice or if you should try a different medication.

Yes, it's possible to give yourself Nucala (mepolizumab) at home if it's appropriate for you. Your care team will probably give you your first injection and show you how to do it safely. If you're comfortable, they might let you do the rest at home. If not, they might decide it's better for you to get your injections from a trained healthcare professional at the medical office. Ask your prescriber if injections at home are right for you.

In general, Nucala (mepolizumab) works over time. It can take weeks or even months to start feeling better. What's more, it can take several months to notice the full benefits of the medication. That's why it's important to keep taking Nucala (mepolizumab) as your prescriber instructs you to. If you're worried about how long it's taking Nucala (mepolizumab) to work, talk to your prescriber.

Yes. In May 2025, the FDA approved Nucala (mepolizumab) to help treat COPD in adults. More specifically, it's used for a type of COPD called eosinophilic COPD. It's added to other treatment when the COPD isn't controlled well enough. Studies showed that adding Nucala (mepolizumab) to triple inhaler therapy lowered the number of bad COPD attacks per year by about 20% when compared to placebo. Ask your pulmonologist if Nucala (mepolizumab) might be right for you.

Nucala (mepolizumab) and Dupixent (dupilumab) are both injections that help lower inflammation in the body. They can both treat severe asthma and are expected to work as well as each other. For asthma, Nucala can be used by people 6 years and older and is given every 4 weeks. Dupixent can be used for people 6 months and older with asthma. And depending on age, it's given either every 2 or 4 weeks. Both medications also treat other inflammatory conditions like COPD, but some are different. Talk to your prescriber to learn about the differences between the medications.

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Risks and warnings for Nucala (mepolizumab)

Nucala (mepolizumab) can cause some serious health issues. This risk may be even higher for certain groups. If this worries you, talk to your doctor or pharmacist about other options.

Allergic reactions

Nucala (mepolizumab) can cause allergic reactions. Signs include hives, wheezing, or trouble breathing. It can also include swelling of the face, mouth, tongue, or throat or other signs of anaphylaxis.

An allergic reaction can happen a few hours after your Nucala (mepolizumab) injection. But in some cases, an allergic reaction can happen a few days later.

Call 911 right away if you have any signs or symptoms of an allergic reaction after taking Nucala (mepolizumab).

Not for an asthma or COPD attack

Don't use Nucala (mepolizumab) to treat an asthma or COPD attack. It doesn't work fast enough to help with sudden breathing problems. Nucala (mepolizumab) is used as maintenance treatment. It helps control your lung condition in the long run.

Always carry a rescue inhaler like albuterol (ProAir) with you. Use it if you suddenly have trouble breathing. Talk to your prescriber if your breathing gets worse after starting Nucala (mepolizumab).

Caution when using corticosteroids

If you're taking oral or inhaled corticosteroids, don't stop or lower the dose without talking to your care team first. Don't do this even if Nucala (mepolizumab) helps you feel better.

Stopping corticosteroids too quickly can make you have uncomfortable withdrawal symptoms. This includes dizziness, body aches, upset stomach, and trouble sleeping. If you need to stop or lower your corticosteroid dose, your prescriber will help you do it slowly and safely. Follow their directions carefully.

Possible herpes zoster infection (shingles)

It's rare, but some people taking 100 mg of Nucala (mepolizumab) got a herpes zoster infection (shingles). Talk to your prescriber to see if you should get Shingrix, the herpes zoster vaccine. The vaccine can help some people from getting this infection.

Unclear effect in people with parasitic worm infections

It's not clear if Nucala (mepolizumab) affects how your body fights off infections from parasitic worms. Before starting treatment, tell your prescriber if you have a worm infection. You'll need to get it treated first.

Call your care team if you get signs of a parasitic worm infection while taking Nucala (mepolizumab). Watch for stomach pain, nausea, vomiting, diarrhea, skin rash, or itching. Your care team can check if you have a worm infection and treat it. If the infection doesn't get better with treatment, you might need to stop Nucala (mepolizumab) until it goes away.

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Nucala (mepolizumab) dosage

The average cost for 1 autoinjector of 100mg/ml of Nucala (mepolizumab) is $0.00 with a free GoodRx coupon.
autoinjectorAutoinjector
DosageQuantityPrice as low asPrice per unit
100mg/ml1 autoinjector$0.00$0.00
syringeSyringe
DosageQuantityPrice as low asPrice per unit
100mg/ml1 syringe$0.00$0.00
40mg/0.4ml1 syringe$0.00$0.00
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100mg1 vial$0.00$0.00

Typical dosage for Nucala (mepolizumab)

  • Severe asthma

    • People 12 years and older: The typical dose is 100 mg injected under the skin once every month.
    • Children 6 to 11 years old: The typical dose is 40 mg injected under the skin once every month.
  • COPD

    • Adults: The typical dose is 100 mg injected under the skin once every month.
  • Chronic rhinosinusitis with nasal polyps

    • People 18 years and older: The typical dose is 100 mg injected under the skin once every month.
  • EGPA

    • Adults: The typical dose is 300 mg injected under the skin once every month. It's given as three separate 100 mg injections, given one right after the other.
  • HES

    • People 12 years and older: The typical dose is 300 mg injected under the skin once every month. It's given as three separate 100 mg injections, given one right after the other.
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What are alternatives to Nucala (mepolizumab)?

There are a number of medications that your doctor can prescribe in place of Nucala (mepolizumab). Compare a few possible alternatives below.
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References

Best studies we found

Akenroye, A., et al. (2022). Comparative efficacy of mepolizumab, benralizumab, and dupilumab in eosinophilic asthma: A Bayesian network meta-analysis. The Journal of Allergy and Clinical Immunology.

American Academy of Allergy, Asthma and Immunology. (2024). Hypereosinophilic syndrome.

American Academy of Allergy, Asthma and Immunology. (2024). Immunosuppressive medication for the treatment of autoimmune disease.

GoodRx Health has strict sourcing policies and relies on primary sources such as medical organizations, governmental agencies, academic institutions, and peer-reviewed scientific journals. Learn more about how we ensure our content is accurate, thorough, and unbiased by reading our editorial guidelines.

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