What is Reslizumab: Uses, Dosage, Side Effects and More

Reslizumab is a specialized medication designed to help people with severe asthma that doesn't respond well to standard treatments. It's a targeted therapy that works by blocking a specific protein in your immune system called interleukin-5, which plays a key role in triggering asthma attacks.

This medication belongs to a class of drugs called monoclonal antibodies. Think of it as a precision tool that helps calm down the overactive immune response that makes severe asthma so difficult to control with regular inhalers and pills.

What is Reslizumab Used For?

Reslizumab is specifically approved for treating severe eosinophilic asthma in adults and children 18 years and older. Eosinophilic asthma is a particular type of severe asthma where certain white blood cells called eosinophils become overactive and cause inflammation in your airways.

Your doctor will typically consider this medication when your asthma remains poorly controlled despite using high-dose inhaled corticosteroids plus another controller medication. It's reserved for cases where traditional treatments haven't provided adequate relief from symptoms like frequent asthma attacks, difficulty breathing, or reduced lung function.

The medication is particularly helpful for people who experience frequent asthma exacerbations that require oral corticosteroids or emergency room visits. It can significantly reduce the number of severe flare-ups and improve your overall quality of life.

How Does Reslizumab Work?

Reslizumab works by targeting and blocking interleukin-5, a protein that signals your body to produce and activate eosinophils. These eosinophils are white blood cells that, when overactive, cause significant inflammation in your airways and make asthma symptoms much worse.

By blocking this specific pathway, reslizumab helps reduce the number of eosinophils in your blood and lungs. This leads to less airway inflammation, fewer asthma attacks, and improved breathing over time.

This is considered a moderately strong medication that works differently from traditional asthma treatments. While inhalers work directly in your lungs, reslizumab works throughout your immune system to address the root cause of eosinophilic asthma.

How Should I Take Reslizumab?

Reslizumab is given as an intravenous infusion, which means it's delivered directly into your bloodstream through a vein in your arm. You'll receive this treatment at your doctor's office, hospital, or infusion center - never at home.

The medication is typically given every four weeks, and each infusion takes about 20 to 50 minutes to complete. Your healthcare team will monitor you closely during and after each infusion to watch for any reactions.

Before each treatment, you don't need to follow any special dietary restrictions. However, it's important to stay well-hydrated and eat normally unless your doctor advises otherwise. You should continue taking your regular asthma medications as prescribed, even while receiving reslizumab.

Your doctor will calculate your exact dose based on your body weight, typically 3 milligrams per kilogram of body weight. This personalized dosing helps ensure you receive the right amount for your specific needs.

How Long Should I Take Reslizumab For?

The duration of reslizumab treatment varies significantly from person to person, depending on how well you respond to the medication and your overall asthma control. Many people continue treatment for several months to years to maintain the benefits.

Your doctor will typically evaluate your progress after the first few months of treatment. They'll look at factors like how often you're having asthma attacks, whether you need fewer oral steroids, and improvements in your lung function tests.

Some people see improvements within the first few treatments, while others may need several months to experience the full benefits. Your healthcare team will work with you to determine the optimal treatment duration based on your individual response and any side effects you might experience.

What Are the Side Effects of Reslizumab?

Like all medications, reslizumab can cause side effects, though many people tolerate it well. Understanding what to expect can help you feel more prepared and know when to contact your healthcare team.

The most common side effects are generally mild and manageable. These reactions typically occur during or shortly after your infusion and often improve as your body adjusts to the medication:

• Headache and fatigue
• Muscle or joint pain
• Throat irritation or sore throat
• Nasal congestion
• Nausea or stomach discomfort
• Dizziness
• Skin reactions at the injection site

Most of these common side effects are temporary and resolve on their own within a day or two after your infusion.

More serious side effects are less common but require immediate medical attention. These include severe allergic reactions during or after the infusion, which is why you'll be monitored closely during treatment:

• Severe allergic reactions with symptoms like difficulty breathing, swelling of face or throat, or severe rash
• Significant drop in blood pressure
• Chest pain or rapid heartbeat
• Severe dizziness or fainting
• Unusual infections due to potential effects on your immune system

Very rare but serious side effects can include an increased risk of certain cancers, though this risk appears to be very low. Your doctor will discuss these rare possibilities with you and weigh them against the benefits of treatment for your severe asthma.

Who Should Not Take Reslizumab?

Reslizumab isn't suitable for everyone, and your doctor will carefully evaluate whether this medication is right for your specific situation. Several factors might make this treatment inappropriate or require special precautions.

You should not receive reslizumab if you've had a severe allergic reaction to it in the past. Additionally, this medication is not approved for children under 18 years of age, as safety and effectiveness haven't been established in younger patients.

Your doctor will be particularly cautious about prescribing reslizumab if you have certain conditions that might increase your risk of complications:

• Current active infections or a history of recurring infections
• Parasitic infections, particularly helminth infections
• Compromised immune system from other medications or conditions
• History of cancer
• Pregnancy or breastfeeding
• Severe liver or kidney disease

If you have any of these conditions, it doesn't automatically mean you can't use reslizumab, but your doctor will need to weigh the risks and benefits more carefully and may require additional monitoring.

Reslizumab Brand Names

Reslizumab is marketed under the brand name Cinqair in the United States and some other countries. This is the primary brand name you'll encounter when discussing this medication with your healthcare team or pharmacist.

In some regions, you might find it under different brand names, but the active ingredient remains the same. Always verify with your healthcare provider that you're receiving the correct medication, especially if you're traveling or receiving treatment in different healthcare systems.

Reslizumab Alternatives

Several other medications work similarly to reslizumab for severe eosinophilic asthma, giving you and your doctor options to find the best treatment for your specific needs. These alternatives are also monoclonal antibodies that target different pathways in the immune system.

Mepolizumab (Nucala) is another medication that targets interleukin-5, similar to reslizumab. It's given as a subcutaneous injection under the skin every four weeks, which some people find more convenient than intravenous infusions.

Benralizumab (Fasenra) targets the interleukin-5 receptor and is also given as a subcutaneous injection. Some people prefer this option because it's administered every eight weeks after the initial loading doses.

For people with allergic asthma, omalizumab (Xolair) targets IgE antibodies and might be a better choice. Dupilumab (Dupixent) is another option that targets interleukin-4 and interleukin-13 pathways.

Your doctor will help determine which alternative might work best based on your specific type of asthma, your eosinophil levels, and other factors like your preference for injection frequency and location.

Is Reslizumab Better Than Mepolizumab?

Both reslizumab and mepolizumab are highly effective medications for severe eosinophilic asthma, and neither is definitively "better" than the other. The choice between them often comes down to practical considerations and individual patient preferences.

Reslizumab is given as an intravenous infusion every four weeks, while mepolizumab is administered as a subcutaneous injection that you can potentially learn to give yourself at home. Some people prefer the convenience of self-injection, while others feel more comfortable with supervised infusions.

Both medications target the same pathway in your immune system and have shown similar effectiveness in clinical trials. They both significantly reduce asthma exacerbations and the need for oral corticosteroids in people with severe eosinophilic asthma.

The decision often depends on factors like your comfort level with different types of injections, your schedule availability for clinic visits, and how your body responds to each medication. Your doctor will consider these factors along with your medical history to help you make the best choice.