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

Cladribine is a prescription medication that helps treat certain types of multiple sclerosis by reducing the activity of immune cells that attack your nervous system. It's a targeted therapy that works differently from many other MS treatments, offering hope for people with relapsing forms of this condition.

This medication belongs to a class of drugs called antimetabolites, which means it interferes with how certain cells grow and multiply. While that might sound concerning, cladribine is carefully designed to target specific immune cells that contribute to MS symptoms while leaving most of your healthy cells alone.

What is Cladribine Used For?

Cladribine is primarily used to treat relapsing forms of multiple sclerosis in adults. Your doctor might recommend this medication if you have relapsing-remitting MS or active secondary progressive MS, where your symptoms come and go in episodes.

Multiple sclerosis happens when your immune system mistakenly attacks the protective covering around your nerve fibers. This creates inflammation and damage that can cause symptoms like fatigue, walking difficulties, numbness, and problems with coordination. Cladribine helps by reducing the number of lymphocytes, which are the specific immune cells causing this damage.

The medication is typically reserved for people who have highly active MS or haven't responded well to other treatments. Your healthcare provider will carefully evaluate your medical history and current condition to determine if cladribine is the right choice for you.

How Does Cladribine Work?

Cladribine works by targeting and reducing specific types of white blood cells called lymphocytes, particularly B cells and T cells that contribute to MS inflammation. Think of it as a selective editor that removes the problematic immune cells while leaving most of your immune system intact.

Once you take the medication, it gets converted into an active form inside these target cells. This active form then interferes with the cells' ability to multiply and survive, leading to a significant but temporary reduction in the immune cells that attack your nervous system.

This is considered a moderately strong medication in the MS treatment spectrum. It's more potent than some first-line treatments but is designed to provide long-lasting benefits with relatively short treatment periods. The effects can last for months or even years after completing the treatment course.

How Should I Take Cladribine?

Cladribine comes as tablets that you take by mouth, typically following a specific schedule over two years. Your doctor will provide detailed instructions, but the usual pattern involves taking the medication for a few days during certain weeks, with long breaks in between.

You should take cladribine tablets on an empty stomach, at least one hour before eating or two hours after eating. Swallow the tablets whole with a full glass of water, and don't crush, chew, or break them. This helps ensure the medication is absorbed properly and works as intended.

It's important to handle the tablets carefully and wash your hands thoroughly before and after taking them. If a tablet breaks or crumbles, don't touch the pieces directly. Instead, use gloves or a damp cloth to clean up, as the medication can be absorbed through your skin.

Your healthcare provider will likely schedule regular blood tests before and during treatment to monitor your white blood cell counts and overall health. These appointments are crucial for ensuring the medication is working safely and effectively.

How Long Should I Take Cladribine For?

The standard cladribine treatment course spans two years, but you won't be taking pills continuously during this time. Instead, you'll have specific treatment periods followed by long medication-free intervals.

Typically, you'll take cladribine for 4-5 days during the first month, then again for 4-5 days in the second month of the first year. The second year follows a similar pattern, with treatment periods in months 13 and 14. After completing this two-year course, many people don't need additional cladribine treatment for several years.

The long gaps between treatment periods allow your immune system to recover while maintaining the medication's protective effects against MS relapses. Your doctor will monitor your condition throughout this time and determine if you need any additional treatments in the future.

Some people may need to adjust their treatment schedule based on blood test results or other health considerations. Your healthcare provider will work with you to find the timing that's both safe and effective for your specific situation.

What Are the Side Effects of Cladribine?

Like all medications, cladribine can cause side effects, though many people tolerate it well. The most common side effects are generally mild and manageable with proper medical support.

Here are the side effects you're most likely to experience, keeping in mind that your healthcare team will monitor you closely throughout treatment:

• Upper respiratory tract infections like colds or sinus infections
• Headaches that may range from mild to moderate
• Reduced white blood cell counts, which is actually part of how the medication works
• Nausea or stomach discomfort, especially when first starting treatment
• Fatigue or feeling more tired than usual
• Hair thinning or temporary hair loss
• Rash or skin reactions

Most of these effects are temporary and improve as your body adjusts to the medication or after completing the treatment course.

There are some more serious but less common side effects that require immediate medical attention. While these are rare, it's important to be aware of them so you can seek help quickly if needed:

• Severe infections due to very low white blood cell counts
• Unusual bleeding or bruising that doesn't heal normally
• Persistent fever or flu-like symptoms
• Severe allergic reactions with difficulty breathing or swelling
• Signs of liver problems like yellowing skin or dark urine
• Progressive multifocal leukoencephalopathy (PML), a rare brain infection

Your doctor will perform regular blood tests to catch any concerning changes early, and you should contact them immediately if you experience any worrying symptoms.

Who Should Not Take Cladribine?

Cladribine isn't suitable for everyone, and your doctor will carefully review your medical history before prescribing it. The medication requires a strong, functioning immune system to start with, so certain conditions make it unsafe.

You should not take cladribine if you have any active infections, including chronic infections like tuberculosis or hepatitis. Your immune system needs to be healthy before starting treatment, as the medication will temporarily reduce your ability to fight off new infections.

People with severe kidney or liver disease typically cannot take cladribine safely. The medication is processed through these organs, and impaired function could lead to dangerous accumulation of the drug in your system.

Pregnancy and breastfeeding are also important considerations. Cladribine can harm developing babies, so you'll need to use effective contraception during treatment and for several months afterward. If you're planning to become pregnant, discuss alternative MS treatments with your doctor.

Additionally, if you have a history of certain cancers, particularly blood cancers, your doctor will need to weigh the risks and benefits carefully before recommending cladribine.

Cladribine Brand Name

The brand name for oral cladribine is Mavenclad, manufactured by EMD Serono. This is the formulation specifically approved for treating multiple sclerosis and comes in 10mg tablets.

You might also hear about cladribine used in other forms for different conditions. For example, there's an injectable form called Leustatin used to treat certain blood cancers, but this is a completely different medication despite sharing the same active ingredient.

When discussing your treatment with healthcare providers or pharmacists, it's helpful to specify that you're taking Mavenclad for MS treatment to avoid any confusion with other cladribine formulations.

Cladribine Alternatives

If cladribine isn't right for you, there are several other effective treatments for relapsing MS that your doctor might consider. The choice depends on your specific symptoms, medical history, and treatment goals.

Some alternatives include dimethyl fumarate (Tecfidera), which is taken twice daily and works by reducing inflammation in the central nervous system. Fingolimod (Gilenya) is another option that prevents immune cells from leaving lymph nodes and attacking the brain and spinal cord.

For people with highly active MS, other strong treatments like natalizumab (Tysabri) or ocrelizumab (Ocrevus) might be considered. These are typically given as infusions rather than daily pills, which some people prefer.

Injectable medications like glatiramer acetate (Copaxone) or interferon beta preparations remain good options for many people, especially those who prefer treatments with longer safety track records.

Your healthcare provider will help you weigh the benefits and risks of each option to find the treatment that best fits your lifestyle and medical needs.

Is Cladribine Better Than Ocrelizumab?

Both cladribine and ocrelizumab are highly effective treatments for relapsing MS, but they work in different ways and have different advantages. The "better" choice depends on your individual circumstances, preferences, and medical history.

Cladribine offers the convenience of oral treatment with long medication-free periods, while ocrelizumab requires infusions every six months but may provide more consistent immune system suppression. Some people prefer the flexibility of taking pills at home, while others appreciate the structured monitoring that comes with infusion treatments.

In terms of effectiveness, both medications significantly reduce relapse rates and disability progression in clinical trials. Cladribine may have a slight edge in terms of brain volume preservation, while ocrelizumab has shown benefits in both relapsing and primary progressive MS.

The side effect profiles are somewhat different too. Cladribine's main concern is the temporary but significant reduction in white blood cells, while ocrelizumab carries a small risk of infusion reactions and may slightly increase infection risk throughout treatment.

Your doctor will consider factors like your current disease activity, previous treatments, lifestyle preferences, and ability to attend regular appointments when helping you choose between these options.