The following adverse reactions have been observed, but there are not enough data to support an estimate of their frequency.
Cardiovascular System: Ventricular arrhythmia, atrial fibrillation, ectopic beats, tachycardia, anginal pain, palpitation, cardiac conduction abnormalities, widened QRS complex, bradycardia, hypotension, hypertension and vasoconstriction.
Respiratory System: Dyspnea.
Gastrointestinal System: Nausea and vomiting.
Metabolic/Nutritional System: Azotemia.
Central Nervous System: Headache and anxiety.
Dermatological System: Piloerection.
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 HCl.