Doxazosin is indicated for the treatment of hypertension and can be used as the sole agent to control blood pressure in the majority of patients. In patients inadequately controlled on single antihypertensive therapy, doxazosin may be used in combination with a thiazide diuretic, beta-adrenoceptor blocking agent, calcium antagonist or an angiotensin-converting enzyme inhibitor.
For this indication, competent medicine agencies globally authorize below treatments:
For: Adults (18-64) Elders (65+)
Oral, 1 milligrams, once daily, over the duration of 1 to 2 weeks. Afterwards, oral, between 2 and 4 milligrams, once daily. The maximum allowed total dose is 16 milligrams daily.
Doxazosin is used in a once daily regimen: the initial dose is 1mg, to minimise the potential for postural hypotension and/or syncope. Dosage may then be increased to 2mg after an additional one or two weeks of therapy and thereafter, if necessary to 4mg. The majority of patients who respond to doxazosin will do so at a dose of 4mg or less. Dosage can be further increased if necessary to 8mg or the maximum recommended dose of 16mg.