A Phase III Clinical Study of KW-2246

Inclusion Criteria: * Provide written informed consent to participate in the study on a voluntary basis. * Patients who have been eligible for the confirmatory trial by meeting the inclusion criteria applicable at the time of giving written informed consent and those applicable at the time of randomization, and who have completed the confirmatory trial. * Outpatients who live with a caregiver such as a family member, or inpatients. * Require rescue medication at least 0.5 times (at least once every two days) but not more than three times per day on average as determined by the investigator. * Performance Status (ECOG) of 3 or less at the time of giving written informed consent. * Have a life expectancy of at least three months as determined by the investigator. * Be able to receive diary training and have been able to properly complete diaries during the confirmatory trial. Exclusion Criteria: * Have experienced intolerable adverse reactions (as defined in Attachment 3) during the confirmatory trial. * Have met any of the exclusion criteria applicable at the time of giving written informed consent, those applicable at the time of randomization, or subject withdrawal criteria in the confirmatory trial. * Serious respiratory dysfunction. * Asthma. * Serious bradyarrhythmia. * Serious hepatic dysfunction. * Serious renal dysfunction. * Susceptibility to respiratory depression due to conditions such as increased intracranial pressure, head injury and brain tumor. * Patients wh…