Clinical Pharmacology Study of Oral Edaravone in Patients With Amyotrophic Lateral Sclerosis

To evaluate the pharmacokinetics of single doses of edaravone oral suspension in Patients with Amyotrophic Lateral Sclerosis

Inclusion Criteria: The key criteria are listed below. * Patients aged between 20 and 75 years at the time of informed consent * Japanese patients * Among patients with ALS, those "Clinically definite ALS," "Clinically probable ALS" or "Clinically probable-laboratory-supported ALS" according to El Escorial Revised Airlie House criteria * Patients who can consent to contraception * Patients who have thoroughly understood the contents of the study and voluntarily provided written informed consent to participate in the study Exclusion Criteria: The key criteria are listed below. * Patients in whom the possibility could not be ruled out that the current symptoms were symptoms of a disease requiring differential diagnosis, such as cervical spondylosis and multifocal motor neuropathy * Patients undergoing treatment for malignancy * Patients who have presence of clinically significant liver, heart, or renal disease requiring hospitalization (except ALS) and infections requiring antibiotics. Patients who have a problem in general condition and are judged ineligible by the Investigator * Body mass index (BMI) of \30.0, or a body weight of \