The most common adverse events in these groups were dyskinesia ( seven -LSB- @ % -RSB- of @ patients in the placebo group , @ -LSB- @ % -RSB- of @ in the @ mg twice-daily group , and @ -LSB- @ % -RSB- of @ in the @ mg twice-daily group ) , nausea ( three -LSB- @ % -RSB- , @ -LSB- @ % -RSB- , and ten -LSB- @ % -RSB- ) , and dizziness ( one -LSB- @ % -RSB- , four -LSB- @ % -RSB- , and @ -LSB- @ % -RSB- ) .