Adverse EffectsCardiovascular: Ventricular arrhythmia, atrial fibrillation (at very high doses), ectopic beats, tachycardia, anginal pain, palpitation, cardiac conduction abnormalities, widened QRS complex, bradycardia, hypotension, hypertension, and vasoconstriction
Gastrointestinal: Nausea and vomiting
Metabolic/nutritional system: Azotemia
Central nervous system: Headache and anxiety
Other: Gangrene of the extremities has occurred when high doses were administered for prolonged periods or in patients with occlusive vascular disease receiving low doses of dopamine HC Medscape: Medscape Access
is an excellent reference.. It requires registration but it is free, no strings.