Patent No. EP1714960 (titled "Novel Therapeutic Agent For Amyotrophic Lateral Sclerosis (Als) Or Disease Attributable To Als") was filed by Mitsubishi Pharma on Feb 9, 2005. The application was issued on Mar 28, 2018.
3-Methyl-1-phenyl-2-pyrazoline-5-on (edaravone), including its physiologically acceptable salts, hydrates, or solvates, is used to treat amyotrophic lateral sclerosis (ALS), manage ALS-related symptoms, or suppress disease progression, such as respiratory function decline. The therapeutic regimen is characterized by the inclusion of at least one drug holiday period—defined as a period without drug administration—occurring once, twice, or more during the treatment course. Specifically, the administration is structured such that both the drug administration period and the drug holiday period each last 14 days. This intermittent dosing strategy aims to provide therapeutic efficacy, including suppressing the decrease in ALSFRS-R scores, while minimizing adverse effects compared to continuous administration.

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