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

Lecanemab is a prescription medication designed to help slow the progression of Alzheimer's disease in its early stages. This groundbreaking treatment works by targeting and removing harmful protein clumps called amyloid plaques that build up in the brain of people with Alzheimer's. While it's not a cure, lecanemab offers hope for those facing this challenging condition by potentially helping preserve thinking abilities and daily functioning for a longer period.

What is Lecanemab?

Lecanemab is a specialized antibody medication that belongs to a class of drugs called monoclonal antibodies. Think of it as a targeted therapy that's designed to recognize and bind to specific amyloid proteins in your brain that contribute to Alzheimer's disease.

The medication is given through an IV infusion directly into your bloodstream, allowing it to reach your brain where it can work on clearing these harmful protein deposits. This treatment represents years of research into understanding how Alzheimer's develops and progresses.

Lecanemab received FDA approval specifically for treating mild cognitive impairment or mild dementia due to Alzheimer's disease. It's important to understand that this medication is most effective when started early in the disease process, before significant brain damage has occurred.

What is Lecanemab Used For?

Lecanemab is specifically approved to treat adults with mild cognitive impairment or mild dementia caused by Alzheimer's disease. This means it's designed for people who are in the earlier stages of the condition, when symptoms are still relatively manageable.

Your doctor will typically recommend this treatment if you've been diagnosed with Alzheimer's disease and tests show you have amyloid plaques in your brain. The medication works best when there's confirmed evidence of these protein deposits through brain imaging or spinal fluid tests.

The goal isn't to reverse existing damage, but rather to slow down the progression of symptoms. This might help you maintain your current level of thinking and daily functioning for a longer period than you would without treatment.

How Does Lecanemab Work?

Lecanemab works by targeting amyloid beta proteins that form sticky plaques in the brain of people with Alzheimer's disease. These plaques are believed to interfere with normal brain cell communication and contribute to the death of brain cells over time.

When you receive lecanemab through IV infusion, the medication travels to your brain and binds to these amyloid proteins. This binding process helps your immune system recognize and remove the plaques more effectively than it would naturally.

The medication is considered moderately strong in its approach to treating Alzheimer's. While it shows promise in clinical trials, the effects are gradual and may take several months to become noticeable. The treatment works progressively over time rather than providing immediate dramatic improvements.

How Should I Take Lecanemab?

Lecanemab is administered as an intravenous infusion at a healthcare facility, typically once every two weeks. The infusion process usually takes about one hour, and you'll need to be monitored during and after the treatment.

You don't need to make any special dietary preparations before receiving lecanemab. You can eat normally before your appointment, and there are no specific foods you need to avoid or consume. However, it's important to stay well-hydrated by drinking plenty of water.

Your healthcare team will likely give you medications before the infusion to help prevent infusion reactions. These might include antihistamines or corticosteroids to reduce the risk of allergic responses or other side effects.

Plan to spend several hours at the treatment center for each visit. This allows time for preparation, the actual infusion, and observation afterward to ensure you're feeling well before going home.

How Long Should I Take Lecanemab For?

The duration of lecanemab treatment varies from person to person and depends on how well you respond to the medication and how you tolerate it. Most people continue treatment as long as they're benefiting from it and not experiencing serious side effects.

Your doctor will regularly monitor your progress through cognitive tests, brain imaging, and assessments of your daily functioning. These evaluations help determine whether the treatment is working effectively for you and if it should be continued.

Some people may need to temporarily stop treatment if they develop certain side effects, particularly brain swelling or bleeding. Your healthcare team will carefully weigh the benefits against any risks throughout your treatment journey.

It's important to understand that stopping lecanemab doesn't mean your condition will suddenly worsen, but the protective effects of the medication will gradually diminish over time.

What Are the Side Effects of Lecanemab?

Like all medications, lecanemab can cause side effects, though not everyone experiences them. Understanding what to expect can help you feel more prepared and know when to contact your healthcare team.

The most common side effects you might experience include infusion reactions during or shortly after treatment. These can feel unsettling, but your healthcare team is well-prepared to manage them if they occur.

• Headache and fatigue
• Nausea or upset stomach
• Dizziness or confusion
• Fever or chills during infusion
• Skin reactions like rash or itching

These common side effects are usually mild to moderate and often improve as your body adjusts to the treatment. Your healthcare team can provide medications to help manage these symptoms if needed.

More serious side effects, while less common, require immediate medical attention. The most concerning is a condition called ARIA (amyloid-related imaging abnormalities), which involves brain swelling or small bleeds.

• Severe headaches that don't improve with usual treatments
• Sudden confusion or changes in thinking
• Vision problems or visual disturbances
• Seizures or unusual movements
• Difficulty speaking or understanding speech

Your doctor will monitor you closely with regular brain scans to watch for these serious side effects. If they occur, treatment may need to be temporarily stopped or permanently discontinued.

Rarely, some people may experience severe allergic reactions or other unexpected side effects. Your healthcare team will discuss your individual risk factors and what warning signs to watch for throughout your treatment.

Who Should Not Take Lecanemab?

Lecanemab isn't suitable for everyone with Alzheimer's disease. Your doctor will carefully evaluate whether this treatment is right for your specific situation and health status.

People with certain genetic factors may have a higher risk of serious side effects. Specifically, those who carry two copies of the ApoE4 gene variant have an increased risk of brain swelling and bleeding. Your doctor may recommend genetic testing before starting treatment.

You should not receive lecanemab if you're currently taking certain blood-thinning medications, as this increases the risk of brain bleeding. Your healthcare team will review all your medications to ensure they're compatible with lecanemab treatment.

People with advanced Alzheimer's disease typically don't benefit from lecanemab, as the medication works best in early stages when there's still significant brain function to preserve. Your doctor will assess your current cognitive status to determine if treatment is appropriate.

If you have a history of brain bleeding, stroke, or certain other neurological conditions, your doctor will need to carefully weigh the potential benefits against the increased risks before recommending lecanemab.

Lecanemab Brand Names

Lecanemab is marketed under the brand name Leqembi in the United States. This is the name you'll see on your prescription and treatment records when receiving the medication.

The medication is manufactured by Biogen and Eisai, two pharmaceutical companies that collaborated to develop this treatment. You may sometimes see it referred to by its scientific name, lecanemab-irmb, particularly in medical literature or research studies.

When discussing your treatment with healthcare providers or insurance companies, you can refer to it by either name. Both Leqembi and lecanemab refer to the same medication.

Lecanemab Alternatives

Currently, there are limited alternatives to lecanemab for treating Alzheimer's disease. Aducanumab (Aduhelm) is another amyloid-targeting therapy, but it's less commonly used due to questions about its effectiveness and higher controversy surrounding its approval.

Traditional Alzheimer's medications like donepezil (Aricept), rivastigmine (Exelon), and memantine (Namenda) work differently from lecanemab. These medications help manage symptoms but don't target the underlying amyloid plaques like lecanemab does.

Some people may use lecanemab alongside these traditional treatments, as they work through different mechanisms. Your doctor will help determine the best treatment approach based on your specific needs and symptoms.

Non-drug approaches like cognitive training, regular exercise, social engagement, and healthy lifestyle choices remain important parts of Alzheimer's care, whether or not you're receiving lecanemab.

Is Lecanemab Better Than Aducanumab?

Lecanemab has shown clearer evidence of effectiveness compared to aducanumab in clinical trials. The studies supporting lecanemab's approval were more robust and showed more consistent benefits in slowing cognitive decline.

Both medications work by targeting amyloid plaques, but lecanemab appears to have a more favorable safety profile with fewer severe side effects. The clinical data supporting lecanemab was also more convincing to regulatory authorities.

Aducanumab faced significant controversy due to mixed trial results and questions about its clinical benefit. Many healthcare providers and insurance companies have been hesitant to recommend or cover aducanumab because of these concerns.

Your doctor will consider your individual situation, including your specific symptoms, health status, and treatment goals, when recommending between these options. The choice isn't always clear-cut and depends on many personal factors.