What is Dimethyl Fumarate: Uses, Dosage, Side Effects and More

Dimethyl fumarate is a medication that helps control multiple sclerosis (MS) by reducing inflammation in your brain and spinal cord. It's an oral capsule that you take twice daily, and it works by changing how your immune system responds to protect your nerve cells from damage.

This medication represents a significant step forward in MS treatment because it can slow down the progression of disability while reducing the frequency of relapses. Many people find it easier to manage than some other MS treatments since it comes in pill form rather than requiring injections.

What is Dimethyl Fumarate?

Dimethyl fumarate is an immunomodulatory drug that belongs to a class of medications called fumaric acid esters. It works by influencing your immune system's behavior rather than suppressing it completely, which helps protect your nervous system from the autoimmune attacks that characterize MS.

The medication was originally developed from fumaric acid, a natural compound found in many plants and even produced by your own body in small amounts. Scientists discovered that this compound could help reduce the inflammatory processes that damage nerve cells in people with MS.

Unlike some MS medications that require careful monitoring of blood counts or liver function, dimethyl fumarate has a relatively straightforward safety profile. This makes it an attractive option for many people who want effective MS treatment without extensive medical monitoring.

What is Dimethyl Fumarate Used For?

Dimethyl fumarate is primarily prescribed for treating relapsing forms of multiple sclerosis in adults. This includes people who experience periodic flare-ups of MS symptoms followed by periods of recovery or stability.

The medication is particularly effective for people with relapsing-remitting MS, which is the most common form of the condition. It can help reduce the number of relapses you experience and may slow down the accumulation of physical disability over time.

Some doctors also prescribe dimethyl fumarate for people with secondary progressive MS if they still experience relapses. However, it's not typically used for primary progressive MS, where symptoms worsen gradually without distinct relapse periods.

In rare cases, healthcare providers might consider this medication for other inflammatory conditions, though this would be an off-label use requiring careful medical supervision and consideration of potential benefits versus risks.

How Does Dimethyl Fumarate Work?

Dimethyl fumarate works by activating a cellular pathway called Nrf2, which helps protect your cells from oxidative stress and inflammation. Think of it as turning on your body's natural defense system against harmful inflammatory processes.

This medication is considered a moderately strong MS treatment that sits between milder therapies and more intensive immunosuppressive drugs. It provides substantial benefits for many people while maintaining a manageable side effect profile.

The drug also appears to shift your immune system away from the inflammatory responses that attack your nervous system. It reduces the activity of certain immune cells that cross into your brain and spinal cord, where they would normally cause damage to the protective covering of nerve fibers.

Additionally, dimethyl fumarate may help promote the survival of nerve cells and support the repair of damaged myelin, the protective coating around nerve fibers that gets damaged in MS.

How Should I Take Dimethyl Fumarate?

You should take dimethyl fumarate exactly as prescribed by your doctor, typically twice daily with food. Taking it with meals helps reduce stomach upset and improves how well your body absorbs the medication.

Swallow the capsules whole with a full glass of water. Don't crush, chew, or open the capsules, as this can cause stomach irritation and may affect how the medication works in your body.

The usual starting dose is often lower than the full therapeutic dose to help your body adjust gradually. Your doctor might start you on 120 mg twice daily for the first week, then increase to the full dose of 240 mg twice daily.

Try to take your doses at roughly the same times each day, such as with breakfast and dinner. This helps maintain steady levels of the medication in your system and makes it easier to remember your doses.

If you experience stomach problems, eating a snack that contains some fat or protein before taking your dose can help. Foods like nuts, cheese, or yogurt work well for this purpose.

How Long Should I Take Dimethyl Fumarate For?

Dimethyl fumarate is typically a long-term treatment that you may need to continue for many years. Most people with MS take it indefinitely as part of their ongoing disease management strategy.

Your doctor will monitor your response to the medication through regular check-ups and MRI scans. If the medication is working well and you're tolerating it without significant side effects, you'll likely continue taking it for the foreseeable future.

Some people may need to stop or switch medications if they experience intolerable side effects or if their MS becomes more active despite treatment. Your healthcare team will work with you to determine the best long-term approach for your specific situation.

It's important never to stop taking dimethyl fumarate suddenly without consulting your doctor, as this could lead to a return of MS activity. If you need to discontinue the medication, your doctor will help you transition safely to another treatment option.

What Are the Side Effects of Dimethyl Fumarate?

The most common side effects of dimethyl fumarate affect your digestive system and skin, particularly during the first few months of treatment. Most people find these effects manageable and notice they improve as their body adjusts to the medication.

Here are the side effects you're most likely to experience, keeping in mind that not everyone will have these reactions:

• Stomach upset, nausea, or cramping
• Diarrhea or loose stools
• Flushing or warmth in your face and neck
• Itching or tingling sensations
• Headache
• Fatigue or feeling tired

These common side effects often improve within the first month of treatment as your body adapts to the medication. Taking your doses with food and staying well-hydrated can help minimize these effects.

Less common but more serious side effects can include significant drops in your white blood cell count, which could increase your risk of infections. Your doctor will monitor your blood counts regularly to watch for this.

Rare but serious side effects include a brain infection called progressive multifocal leukoencephalopathy (PML), though this is extremely uncommon. Severe allergic reactions, liver problems, and severe drops in blood cell counts are also possible but rare.

If you experience persistent vomiting, severe abdominal pain, signs of infection like fever, or any concerning symptoms, contact your healthcare provider promptly.

Who Should Not Take Dimethyl Fumarate?

Dimethyl fumarate isn't suitable for everyone, and certain health conditions or circumstances make it inadvisable. Your doctor will carefully evaluate whether this medication is right for your specific situation.

You should not take dimethyl fumarate if you have a known allergy to the medication or any of its ingredients. People with severe kidney or liver disease may also need to avoid this medication or use it with extreme caution.

The safety of dimethyl fumarate during pregnancy and breastfeeding isn't fully established, so women who are pregnant, planning to become pregnant, or breastfeeding typically need alternative treatments.

People with active serious infections should not start dimethyl fumarate until the infection is fully treated. Those with very low white blood cell counts or a history of PML should also avoid this medication.

If you're taking other medications that affect your immune system, your doctor will need to carefully consider potential interactions and may recommend a different treatment approach.

Dimethyl Fumarate Brand Names

Dimethyl fumarate is available under the brand name Tecfidera, which is manufactured by Biogen. This was the first FDA-approved formulation of dimethyl fumarate for MS treatment.

Generic versions of dimethyl fumarate have become available in recent years, offering the same active ingredient at potentially lower costs. These generic formulations must meet the same safety and effectiveness standards as the brand-name version.

Your pharmacy may automatically substitute a generic version unless your doctor specifically requests the brand-name medication. Both versions work the same way and have similar side effect profiles.

If you're switching between brand-name and generic versions, let your doctor know so they can monitor your response to ensure continued effectiveness.

Dimethyl Fumarate Alternatives

Several other oral medications are available for treating MS if dimethyl fumarate isn't suitable for you. These alternatives work through different mechanisms and may be better options depending on your specific needs and health profile.

Fingolimod (Gilenya) is another oral MS medication that works by keeping immune cells trapped in lymph nodes. It's effective but requires more intensive monitoring, including heart monitoring when you start treatment.

Teriflunomide (Aubagio) is an oral medication that works by reducing immune cell activity. It has a different side effect profile and may be suitable for people who can't tolerate dimethyl fumarate.

Newer oral options include siponimod (Mayzent) for secondary progressive MS and ozanimod (Zeposia) for relapsing forms of MS. These medications offer different mechanisms of action and side effect profiles.

Injectable medications like interferons and glatiramer acetate remain important options, as do infusion therapies like natalizumab and rituximab for people with more active disease.

Is Dimethyl Fumarate Better Than Glatiramer Acetate?

Dimethyl fumarate and glatiramer acetate are both effective MS treatments, but they work differently and have distinct advantages. The choice between them depends on your individual preferences, medical history, and treatment goals.

Dimethyl fumarate offers the convenience of oral administration twice daily, while glatiramer acetate requires daily injections. Many people prefer taking pills over giving themselves injections, making dimethyl fumarate more appealing from a lifestyle perspective.

In terms of effectiveness, both medications can reduce relapse rates and slow disability progression. Some studies suggest dimethyl fumarate may have a slightly stronger effect on reducing relapses, but both are considered effective first-line treatments.

The side effect profiles differ significantly. Dimethyl fumarate commonly causes flushing and stomach upset, while glatiramer acetate typically causes injection site reactions and less commonly, chest tightness or anxiety immediately after injection.

Your doctor will consider factors like your injection tolerance, stomach sensitivity, lifestyle preferences, and overall health when helping you choose between these options.