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After oral doses its hypotensive effects are seen within 15 minutes and may last for up to 24 hours, permitting once daily. To avoid the risk of collapse which may occur in some patients after the first dose the initial dose for both hypertension and benign prostatic hyperplasia is 1 mg of Terazosin at bedtime, increasing gradually at intervals of 7 days according to patients response.
For hypertension, the usual maintenance dose is 2 to 10 mg once daily and maximum dose is 20 mg daily in a single dose or two divided doses. For benign prostatic hyperplasia, the usual maintenance dose is 5-10 mg daily or as prescribed by physician.
