The recommended initial dosage for hypertension is 1 mg orally once daily, either in the morning or evening. Depending on individual response, the dose may be increased at 1 to 2-week intervals, up to a maximum of 16 mg daily. For BPH, the initial dose is also 1 mg once daily, with potential titration to 2 mg, 4 mg, and up to 8 mg daily, based on patient response and tolerability. It's important to monitor blood pressure regularly during treatment.