Symptoms: Overdosage may cause excessive peripheral vasodilation with marked hypotension and sometimes bradycardia.
Management: Activated charcoal, if necessary gastric lavage.
If severe hypotension occurs, symptomatic treatment should be instituted.
The patient should be placed supine with the legs elevated. In case of accompanying bradycardia, atropine 0.5-1 mg should be administered intravenously. If this is not sufficient, plasma volume should be increased by infusion of e.g. glucose, saline, or dextran. Sympathomimetic drugs with predominant effect on the α1-adrenoceptor may be given if the previously mentioned measures are insufficient.