amnesia (5%), nervousness (5%), orthostatic hypotension (5%), peripheral edema (4%), vertigo (4%), back pain (3%), hypertension (3%), hypotension (2%), insomnia , injury, aggravated Parkinsonism , viral infection , abnormal dreams , bronchitis , vertigo , pyrexia , flatulence , nasopharyngitis , myalgia , and sleep disorder have been reported. Side Effects to