Vascular effects of phenylpropanolamine on human nasal mucosa

The duration of the decongestant effect of phenylpropanolamine 2.5% as nose drops as well as the effect of the drug on nasal mucosal blood flow was studied in man. The nasal patency was significantly improved for up to three hours in patients with nasal congestion, while no effect on nasal mucosal blood flow was achieved. These results were discussed in relation to other more long-lasting nose-drops with blood flow-reducing effects.