At-home Leqembi IQLIK is an Alzheimer's disease treatment approved in July 2026 that lets patients receive their first doses at home, but anyone starting it must have brain MRI scans at multiple points to catch potentially serious brain swelling. Because Leqembi works by clearing amyloid plaques—toxic protein clumps in Alzheimer's brains—it can cause amyloid-related imaging abnormalities (ARIA), a sometimes dangerous side effect visible only on MRI that requires close monitoring to prevent harm. For patients with mild cognitive impairment or mild dementia due to Alzheimer's, these scans are not optional: the FDA requires a baseline MRI within one year before treatment starts, plus additional scans at 2–6 months and before the third dose to detect early warning signs.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What MRI Schedule Will You Need?
- Why ARIA Screening Matters—And When to Act
- Before MRI: Proving You Qualify
- Ongoing Monitoring Beyond MRI
- How to Prepare for MRI Monitoring
- Frequently Asked Questions
What MRI Schedule Will You Need?
Baseline MRI comes first: you'll need a brain scan completed within the year before starting Leqembi. This establishes your brain's normal appearance and rules out other conditions that might look like ARIA or affect safety. Once you begin the once-weekly 500 mg subcutaneous injections (two 250 mg doses), the timing tightens.
The FDA recommends an MRI before your third dose, plus scans every 2–6 months during the first year of treatment. These scans will continue long term but typically become less frequent after the initial monitoring window, pending your neurologist's assessment. The exact schedule depends on your specific findings and symptom changes, so ask your doctor for a written timeline before you start.
Why ARIA Screening Matters—And When to Act
The reason for this intensive scanning is ARIA: leqembi causes brain swelling (called ARIA-E) in approximately 13% of patients versus 2% taking placebo—a significant increase. Brain swelling can cause confusion, memory loss, seizures, or headaches, and it has caused fatalities in rare cases. Many ARIA cases are caught on MRI before symptoms develop, which is why scans are your safety net: they let your doctor pause or stop treatment before serious harm occurs.
You should also watch for warning signs between scans. Call your neurologist immediately if you experience new confusion, severe headache, seizure, vision changes, or balance problems. Some ARIA cases show symptoms that line up with scan findings; catching them early gives doctors the best chance to intervene.
Before MRI: Proving You Qualify
Before your baseline MRI, you'll need to confirm that Leqembi is right for you. The treatment is approved only for mild cognitive impairment or mild dementia due to Alzheimer's disease, not for asymptomatic people or those with moderate to severe dementia. You'll also need proof of amyloid pathology via a PET scan, spinal fluid test, or blood biomarker—Leqembi only works if you actually have amyloid in your brain.
Once amyloid is confirmed and you've had your baseline MRI, a specialty pharmacy will dispense your injections and coordinate with your neurologist. You'll also need baseline cognitive testing to measure how you're thinking right now, so doctors can compare your results over time. These steps take weeks to arrange, so plan ahead if you're interested in starting soon.
Ongoing Monitoring Beyond MRI
MRI is critical, but it's not the whole picture. Your doctor will check you regularly for any signs of ARIA or other side effects—confusion, unusual headaches, seizures, or vision problems all warrant immediate contact. About 14% of patients experience brain microhemorrhages (ARIA-H) and 13% experience brain swelling, while 11% report severe headaches, so your clinical team will ask about symptoms at each visit.
You'll also repeat cognitive testing at regular intervals to track whether Leqembi is helping you think more clearly. The medication reduced cognitive decline by 27% versus placebo over 18 months in trials, but results vary, and your own progress is what matters most. A caregiver's input during these check-ins is invaluable—they often notice subtle changes you might miss.
How to Prepare for MRI Monitoring
Start now by asking your neurologist for a written monitoring plan. Request the exact schedule, which imaging center you'll use, and what to do if you miss a scan. If cost is a concern, ask whether your insurance covers the baseline and monitoring scans—many do, though out-of-pocket costs can still occur.
Bring a list of all medications and supplements to your first appointment; some can affect MRI safety or results. Designate a caregiver to help track appointments and watch for warning signs, especially if you live alone. Write down any new symptoms—headaches, confusion, balance problems, or seizures—and mention them at your next visit, even if they seem minor. Most importantly, do not skip scans to save time or money; they are your early warning system for ARIA and irreplaceable for safe treatment.
Frequently Asked Questions
Can I get the first few doses at home if I skip MRI monitoring?
No. The FDA requires a baseline MRI within one year before Leqembi initiation, and regular scans before the third dose and every 2–6 months after are mandatory to catch ARIA early. Specialty pharmacies will not dispense without proof of compliance.
What happens if my MRI shows ARIA-E?
Your neurologist will decide whether to pause treatment, continue with closer monitoring, or stop Leqembi entirely. Many mild cases resolve after a brief pause. Severe swelling may require stopping treatment, but the goal is to catch it before you develop serious symptoms.
Is MRI safe if I have a pacemaker or metal implant?
Traditional MRI may not be safe with certain devices. Tell your neurologist about any implants before scheduling—your center may use a special MRI protocol or an alternative imaging method like ultrasound or CT, though these are less sensitive for ARIA detection.
How much does MRI monitoring cost out of pocket?
Baseline and monitoring scans are typically covered by Medicare and many private insurance plans, but copays, deductibles, and coinsurance can vary widely. Contact your insurance before starting and ask your neurologist's office about financial assistance programs.
