<p>In cases of over dosage, hospital admission is strongly advised. Over dosage may produce respiratory depression, paranoid psychosis, delusions, hallucinations, and convulsion. Treatment should include emptying the stomach by aspiration or gastric lavage. Nervous stimulation and convulsions should be treated with a sedative such as diazepam intramuscularly. If marked excitation is present, a sedative such as diazepam or a short-acting barbiturate may be given.<br />
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Severe over dosage of phenylephrine hydrochloride may produce hypertension and associated reflex bradycardia. Treatment measures include early gastric lavage and symptomatic and supportive measures. The hypertensive effects may be treated with an alpha-receptor blocking agent (such as phentolamine mesilate 6-10 mg) given intravenously, and the bradycardia treated with atropine, preferable only after the pressure has been controlled.</p>