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

Axatilimab is a newer medication that helps treat chronic graft-versus-host disease (cGVHD) when other treatments haven't worked well enough. This condition can develop after certain bone marrow or stem cell transplants, where the donated cells attack your body's healthy tissues.

Think of axatilimab as a targeted therapy that works specifically on immune system signals that cause inflammation. It's given through an IV infusion at a medical facility, and your healthcare team will monitor you closely throughout treatment.

What is Axatilimab Used For?

Axatilimab treats chronic graft-versus-host disease in adults and children who are at least 12 years old. This condition happens when donated stem cells or bone marrow cells recognize your body as foreign and start attacking healthy organs and tissues.

Your doctor will typically consider axatilimab if you've already tried at least two other treatments for cGVHD without enough improvement. The medication is specifically designed for cases where the disease has become chronic, meaning it's been ongoing rather than acute.

Chronic GVHD can affect multiple parts of your body, including your skin, mouth, eyes, liver, lungs, and digestive system. Axatilimab helps reduce the inflammation and immune system overactivity that causes these symptoms.

How Does Axatilimab Work?

Axatilimab works by blocking a specific protein called CSF-1R (colony-stimulating factor-1 receptor). This protein normally helps certain immune cells called macrophages grow and become active.

In chronic GVHD, these macrophages contribute to ongoing inflammation and tissue damage. By blocking CSF-1R, axatilimab reduces the number and activity of these problematic immune cells, which helps calm down the inflammatory response.

This is considered a moderately strong medication because it specifically targets part of your immune system. The effects are focused rather than affecting your entire immune system, which can make it more tolerable than some other treatments.

How Should I Take Axatilimab?

Axatilimab is given only through an IV infusion at a hospital or infusion center. You cannot take this medication at home, and it's not available as a pill or injection you can give yourself.

The typical dose is based on your body weight, usually 0.3 mg per kilogram. Your healthcare team will calculate the exact amount you need and prepare the infusion accordingly.

You'll receive the medication every other week (every 14 days) during your treatment cycle. Each infusion takes about 60 minutes, and you'll need to stay for observation afterward to make sure you don't have any immediate reactions.

You don't need to fast before your infusion, but it's fine to eat a light meal beforehand. Some people find it helpful to bring snacks and water for during the treatment, as you'll be sitting for a while.

How Long Should I Take Axatilimab For?

The length of axatilimab treatment varies significantly from person to person. Your doctor will continue treatment as long as it's helping control your chronic GVHD symptoms and you're tolerating it well.

Many people continue treatment for several months to over a year. Your healthcare team will regularly assess how well the medication is working by examining your symptoms and may do blood tests or other monitoring.

If your symptoms improve significantly, your doctor might consider spacing out the infusions or eventually stopping treatment. However, some people need ongoing treatment to keep their chronic GVHD under control.

What Are the Side Effects of Axatilimab?

Like most medications, axatilimab can cause side effects, though not everyone experiences them. The most common side effects tend to be manageable and often improve as your body adjusts to the treatment.

Here are the side effects you're most likely to encounter during treatment:

• Fatigue or feeling more tired than usual
• Swelling in your hands, feet, or legs (edema)
• Muscle or joint pain
• Headache
• Nausea or stomach discomfort
• Diarrhea
• Skin reactions at the IV site

Most of these common side effects are mild to moderate and don't require stopping treatment. Your healthcare team can often help manage them with supportive care or other medications.

Some less common but more serious side effects can occur, and it's important to be aware of these possibilities:

• Serious infections due to lowered immune function
• Infusion reactions during or shortly after treatment
• Significant fluid retention or swelling
• Liver function changes
• Low white blood cell counts

Your medical team will monitor you closely for these more serious effects through regular blood tests and physical exams. They'll also watch you during and after each infusion for any immediate reactions.

Who Should Not Take Axatilimab?

Axatilimab isn't right for everyone, and your doctor will carefully consider whether it's safe for your specific situation. The medication is not recommended if you have certain active infections or severely compromised immune function.

You should not receive axatilimab if you're allergic to the medication or any of its ingredients. Your doctor will review your allergy history before starting treatment.

People with active, serious infections typically need to wait until the infection is treated before starting axatilimab. Since the medication affects your immune system, it could make infections harder to fight off.

Pregnant women should not receive axatilimab, as it could harm the developing baby. If you're of childbearing age, your doctor will discuss effective birth control methods during treatment.

People with severe liver disease or significantly low blood cell counts may not be good candidates for this treatment. Your doctor will review your blood tests and overall health status before making a decision.

Axatilimab Brand Name

Axatilimab is sold under the brand name Niktimvo. This is the only brand name currently available for this medication.

When you receive your treatment, the medication vial or bag will be labeled with "Niktimvo" along with the generic name axatilimab. Both names refer to the same medication.

Axatilimab Alternatives

Several other medications can treat chronic graft-versus-host disease when axatilimab isn't suitable or available. The choice depends on your specific symptoms, previous treatments, and overall health.

Other targeted therapies include ruxolitinib (Jakafi), which blocks different immune system signals, and belumosudil (Rezurock), which works on a pathway called ROCK2. These medications have different side effect profiles and may be better suited for some people.

Traditional treatments like corticosteroids, immunosuppressive drugs (such as cyclosporine or tacrolimus), and phototherapy might also be options depending on your situation.

Your doctor will consider factors like which treatments you've already tried, your current symptoms, and your overall health when recommending the best approach for you.

Is Axatilimab Better Than Ruxolitinib?

Both axatilimab and ruxolitinib are effective treatments for chronic GVHD, but they work through different mechanisms and may be better suited for different people. There's no single "better" choice that applies to everyone.

Axatilimab specifically targets macrophages and may be particularly helpful for certain types of chronic GVHD symptoms. Ruxolitinib blocks JAK proteins and has been available longer, so doctors have more experience with it.

The side effect profiles differ between these medications. Ruxolitinib can cause more blood count changes, while axatilimab may cause more fluid retention and swelling.

Your doctor will consider your specific symptoms, previous treatments, other health conditions, and personal preferences when choosing between these options. Some people may try one medication first and switch to the other if needed.