Terazosin (Oral)

Terazosin (By Mouth)

Terazosin (ter-AY-zoe-sin)

Treats high blood pressure and enlarged prostate (benign prostatic hyperplasia (BPH)).

Brand Name(s):

There may be other brand names for this medicine.

When This Medicine Should Not Be Used:

You should not use this medicine if you have ever had an allergic reaction to terazosin.

How to Use This Medicine:

Capsule, Tablet, Liquid Filled Capsule

  • Your doctor will tell you how much of this medicine to take and how often. Your dose may need to be changed several times in order to find out what works best for you. Do not take more medicine or take it more often than your doctor tells you to.  
  • Take this medicine at bedtime unless your doctor tells you otherwise.  
  • Carefully follow your doctor’s instructions about any special diet.

If a dose is missed::

  • If you miss a dose or forget to take your medicine, take it as soon as you can. If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.

How to Store and Dispose of This Medicine:

  • Store the medicine at room temperature in a closed container, away from heat, moisture, and direct light. Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.  
  • Keep all medicine away from children and never share your medicine with anyone.

Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Make sure your doctor knows if you are also using verapamil (Calanreg;, Coverareg;), diuretics or “water pills” (such as furosemide, hydrochlorothiazide, Aldactazidereg;, Aldactonereg;, Dyazidereg;, Hyzaarreg;, Lasixreg;, Lotrelreg;, Maxzidereg;, Modureticreg;, Norvascreg;, Zestoreticreg;), or any other blood pressure medicine (such as atenolol, metoprolol, Accuprilreg;, Altacereg;, Cardizemreg;, Cardurareg;, Lotensinreg;, Lotrelreg;, Monoprilreg;, Plendilreg;, Prinivilreg;, Tiazacreg;, Toprolreg;, Vasotecreg;, Zestrilreg;).  
  • Do not drink alcohol while you are using this medicine.

Warnings While Using This Medicine:

  • Make sure your doctor knows if you are pregnant or breastfeeding.  
  • If you stop using this medicine, your blood pressure may go up. High blood pressure usually has no symptoms. Even if you feel well, do not stop using the medicine without asking your doctor.  
  • Do not stop using this medicine without asking your doctor. If you have not taken the medicine for several days, you will need to use a lower dose when you start taking it again.  
  • Your doctor will need to check your progress at regular visits while you are using this medicine. Be sure to keep all appointments.  
  • This medicine may make you dizzy or drowsy. Avoid driving, using machines, or doing anything else that could be dangerous if you are not alert.

Possible Side Effects While Using This Medicine:

Call your doctor right away if you notice any of these side effects:

  • Allergic reaction: Itching or hives, swelling in face, lips, or hands, swelling or tingling in the mouth or throat, tightness in chest, trouble breathing  
  • Chest pain (may be related to your disease and not a side effect)  
  • Fast or pounding heartbeat  
  • Fever, chills, sore throat  
  • Lightheadedness or fainting  
  • Numbness or tingling in the hands or feet  
  • Prolonged or painful erection  
  • Swelling in the hands, ankles, or feet, rapid weight gain

If you notice these less serious side effects, talk with your doctor:

  • Blurred vision  
  • Muscle or joint pain  
  • Nausea  
  • Problems with sex  
  • Runny or stuffy nose  
  • Tiredness

Johns Hopkins patient information

Copyright 1996-2014 Cerner Multum, Inc. Version: 16.02.
Revision date: June 21, 2011
Last revised: by Jorge P. Ribeiro, MD

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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.

The drug reference included in this section is provided by Cerner Multum, Inc., of Denver, Colorado. Armenian Medical Network receives monthly updates from Multum.