To assess changes with respect to Erectile Dysfunction in subjects treated with Viagra and antihypertensive therapy.

Inclusion Criteria:

• Subjects with arterial hypertension treated with one or more antihypertensive agents, the doses of which have been stable for at least 4 weeks prior to the baseline visit, with a documented clinical diagnosis of ED and a confirmation of this by a qualification of 21 or less on the SHI-M.

Exclusion Criteria:

• Subjects with resting sitting systolic blood pressure >170 or <110mmHg or resting sitting diastolic blood pressure >90 or <50mmHg, with significant cardiovascular disease and retinitis pigmentosa, treatment with nitrates, alfablockers or CYP3A4 inhibitors.