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Clinical trials and research at Eisai Inc.

• 12Clinical trials
• 13Countries

Newest trials

All recruiting trials (12)

• Lecanemab-irmb in Real-World Use for Alzheimer’s Disease

  This study tests the safety of lecanemab-irmb in people with Alzheimer’s disease by looking at real-world brain-image changes and related events.

  Recruiting Eisai Inc. · Nutley, New Jersey · NCT07821658

• E2086: See if it interacts with other drugs when taken with common medications

  This small early study tests whether E2086 changes the way certain medicines work when taken together in healthy adults.

  Recruiting Phase 1 Eisai Inc. · Austin, Texas · NCT07766369

• Post-authorization registry of people treated with LEQEMBI

  This registry will track how often and how severe known brain imaging side effects occur in people with Alzheimer's who are taking LEQEMBI in routine clinical care in Canada.

  Recruiting at 3 sites Eisai Inc. · Calgary, Alberta and 16 other locations · NCT07762092

• E6742 for adults with active systemic lupus erythematosus

  This trial tests whether different doses of E6742 help adults with active systemic lupus erythematosus reduce disease activity while on a low dose of oral steroids by Week 24.

  Recruiting at 46 sites Phase 2 Eisai Inc. · Bengbu, Anhui and 53 other locations · NCT07515014

• E2086 for adults with narcolepsy: find the best dose compared with placebo

  This study tests different doses of E2086 against placebo in adults with narcolepsy to see if it reduces daytime sleepiness.

  Recruiting at 2 sites Phase 2 Eisai Inc. · Santa Ana, California and 56 other locations · NCT07493265

• Postmarketing safety monitoring of LEQEMBI in people with Alzheimer's disease in South Korea

  This follow-up will see if LEQEMBI is safe for people with Alzheimer's in South Korea by tracking brain imaging findings and bleeding-related side effects.

  Recruiting Eisai Inc. · Nutley, New Jersey · NCT06810960

• Tasfygo for unresectable FGFR2‑fusion biliary tract cancer after chemotherapy

  This study will see if Tasfygo is safe for people with unresectable biliary tract cancer who have an FGFR2 fusion and whose disease progressed after chemotherapy.

  Recruiting Eisai Inc. · Tokyo · NCT06793709

• Evaluating the safety of Fycompa injection for seizures

  This study is testing the safety of a new injection called Fycompa for people with epilepsy who have certain types of seizures.

  Recruiting Eisai Inc. · Tokyo · NCT06657378

• Observing the effects of lecanemab in early Alzheimer's disease patients

  This study looks at how lecanemab affects early Alzheimer's patients and what happens to them if they experience certain side effects while on the treatment.

  Recruiting at 3 sites Eisai Inc. · Hiroshima and 2 other locations · NCT06322667

• Evaluating the safety and effectiveness of Jyseleca tablet in Korean patients

  This study is testing how safe and effective the Jyseleca tablet is for Korean patients with rheumatoid arthritis and ulcerative colitis who haven't found relief with other treatments.

  Recruiting at 57 sites Eisai Inc. · Cheonan, Chungcheongnam-do and 58 other locations · NCT06246123

• Evaluating a new treatment for certain solid tumors

  This study is testing a new treatment called farletuzumab ecteribulin to see if it can safely help people with certain solid tumors like ovarian and breast cancer.

  Recruiting at 10 sites Phase 1/2 Eisai Inc. · Tucson, Arizona and 57 other locations · NCT04300556

• Evaluating the effects of tasurgratinib in patients with mild to moderate liver impairment

  This study tests how well the drug tasurgratinib works in people with mild to moderate liver problems compared to healthy individuals.

  Recruiting at 7 sites Phase 1 Eisai Inc. · Hakata, Fukuoka and 7 other locations · NCT04271488

Quick answers

How many clinical trials run by Eisai Inc. are recruiting right now?

12, as of November 12, 2026. We update this list each time we refresh our data from ClinicalTrials.gov.

Where are these trials running?

In 13 countries. The most sites are in Japan (7 trials), United States (5 trials), South Korea (3 trials), Spain (2 trials), China (2 trials). Each study page lists its sites and which ones are recruiting.

What phases are they in?

Phase 1: 2, Phase 2: 2, Phase 1/2: 1. Trials with no phase listed are usually device, behavioural or observational studies.

How do I join one?

Open a study, check the "Is this trial a fit for you?" section, then contact the study team listed on the page. They will ask a few screening questions. Asking is free and does not commit you to anything. Talk it over with your doctor first.

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