<p>It should be avoided in patients with liver disease or asthmatic patients and is contraindicated in patients taking monoamine oxidase inhibitors or within 2 weeks from stopping such treatment, known hypersensitivity to phenylephrine hydrochloride, dextromethorphan hydrobromide and during acute attacks of asthma. It is contraindicated in patients with severe hypertension or severe coronary artery disease.</p>