Take this medication by mouth with or without food as directed by your doctor, usually 2 times a day. The dosage is based on your medical condition, your response to treatment, and other medications you may be taking. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

To reduce your risk of side effects from low blood pressure (such as dizziness, fainting, fast heartbeat), your doctor will start you on a low dose and gradually increase your dose until you are taking the best dose for you. It may take 1 to 2 weeks before you are taking your full dose. Follow your doctor's directions carefully.

Take this medication regularly to get the most benefit from it. To help you remember, take it at the same times each day. If you miss or stop taking this medication for more than 3 days, do not restart taking this medication at the same dose without calling your doctor first. Your doctor may direct you to restart at a low dose and gradually increase the dose.

Keep taking this medication exactly as prescribed, even if you are feeling better and thinking more clearly. Do not increase your dose or take this drug more often than prescribed. Your symptoms will not improve any faster, and your risk of side effects will increase. Do not stop taking this medication without consulting your doctor.

Tell your doctor if your condition does not improve or if it worsens. It may take several weeks before you feel the full benefit of this medication.