<p>Vardenafil can potentiate the blood pressure lowering effect of antihypertensive agents. In clinical studies, single doses of Vardenafil 20 mg caused a mean decrease in blood pressure of 7 mmHg systolic and 8 mmHg diastolic. Caution should be taken when co-administered with other vasodilators including alpha blockers. Vardenafil does not potentiate the hypotensive effect of alcohol. CYP3A4 inhibitors (ketoconazole, indinavir, ritonavir and erythromycin) may reduce Vardenafil excretion from body.</p>