Study to assess safety, pharmacodynamics and pharmacokinetics of BIIB 722 CL

Inclusion Criteria:

• Healthy males
• 18 to 55 years of age
• Broca index >= -20% and <= +20%
• Written informed consent according to Good Clinical Practice (GCP) and local legislation

Exclusion Criteria:

• Any finding of the medical examination (including blood pressure, pulse rate and ECG) deviating from normal and of clinical relevance
• History or current gastrointestinal hepatic, renal, respiratory, cardiovascular, metabolic, immunologic, hormonal disorders
• History of orthostatic hypotension, fainting spells or blackouts
• Diseases of the central nervous system (such as epilepsy) or psychiatric disorders or neurological disorders
• Chronic or relevant acute infections
• History of allergy/hypersensitivity (including drug allergy) which is deemed relevant to the trial as judged by the investigator
• Intake of drugs with a long half-life (> 24 hours) within 1 month prior to administration
• Use of any drugs, which might influence the results of the trial within 10 days prior to administration or during the trial
• Participation in another trial with an investigational drug within 2 months prior to administration of during trial
• Smoker (> 10 cigarettes or 3 cigars or 3 pipes/day) or inability to refrain from smoking on study days
• Alcohol abuse (> 60 g/day)
• Drug abuse
• Blood donation within 1 month prior to administration or during the trial
• Excessive physical activities within 5 days prior to administration or during the trial
• Any laboratory value outside the clinically accepted reference range