Properties and side effects		Bromocriptine (Parlodel)	Pergolide (Permax)	Pramipexole (Mirapex)	Ropinirole (Requip)
Properties
Initial dosage		1.25 mg twice daily	0.05 mg at bedtime	0.125 mg three times daily	0.25 mg three times daily
Half-life		10 to 12 hours	16 to 24 hours	8 hours	6 hours
Side effects
Somnolence		+	++	+++	++
Insomnia		+	++	++++	+
Dizziness or lightheadedness		+++	+++	+++	++
Hallucinations or confusion		+++	++	++	++
Headache		+++	+++		++
Orthostasis		+++	+++	++	+++
Nausea		++++	++++	++++	++
Constipation			++	++
Others
	Arthralgia				++
	Blurred vision		++	+
	Dry mouth		+++	++
	Pleurisy	++
	Upper respiratory Infection				++