This medication is used to treat high blood pressure (hypertension).

Dizziness, lightheadedness, tiredness, nausea, drowsiness, blurred vision, headache, or stuffy nose may occur. If any of these effects persist or worsen, tell your doctor or pharmacistpromptly.

It is contraindicated in patients with known hypersensitivity to the drug.

Before taking terazosin, tell your doctor or pharmacist if you are allergic to it; or to other alpha blockers such as doxazosin or prazosin; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: low blood pressure/fainting, certain eye problems (cataracts, glaucoma).

If you are taking this drug for the first time, do not take more than 1 milligram to start. Terazosin may cause a sudden drop in your blood pressure, which could lead to dizziness or fainting. This risk is higher when taking your first dose. Therefore, to avoid injury related to dizziness or fainting, take your first dose of terazosin at bedtime.

If you are taking this medication for high blood pressure, it is important to continue taking this medication even if you feel well. Most people with high blood pressure do not feel sick. Tell your doctor if your blood pressure readings remain high or increase.

Please consult your doctor when taking this medicine if you are pregnant.

Some products that may interact with this drug include: other alpha blocker drugs (such as prazosin, tamsulosin).