What is terazosin?
Terazosin is in a group of drugs called alpha-adrenergic blockers. Terazosin causes the blood vessels (veins and arteries) to relax and expand, improving blood flow. Terazosin also relaxes muscles in the prostate and bladder neck, making it easier to urinate.
Terazosin is used to treat hypertension (high blood pressure) and benign prostatic hyperplasia (enlarged prostate).
Terazosin may also be used for purposes other than those listed in this medication guide.
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Precautions
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Instructions
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Side Effects
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Interactions
Precautions
Terazosin can affect the pupils of your eyes during cataract surgery. If you have cataract surgery during your treatment with terazosin, tell the surgeon ahead of time that you take terazosin. Do not stop using the medication before surgery unless your surgeon tells you to.
FDA pregnancy category C. This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.
It is not known whether terazosin passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.
Terazosin can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.
Avoid using other medicines that make you sleepy (such as cold medicine, pain medication, muscle relaxers, and medicine for seizures, depression or anxiety). They can add to sleepiness caused by terazosin.
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Instructions
Seek emergency medical attention if you think you have used too much of this medicine.
Symptoms of a terazosin overdose may include dizziness, fainting, shallow breathing, a weak but rapid pulse, and cold, clammy skin.
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.
If you miss doses for several days in a row, call your doctor before taking any additional doses. You may need to use a lower dose of terazosin for a short time.
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Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
- fast or pounding heartbeats;
- feeling light-headed, fainting;
- swelling in your hands, ankles, or feet; or
- penis erection that is painful or lasts 4 hours or longer.
Other, less serious side effects may be more likely to occur, such as:
- weakness;
- headache;
- numbness or tingly feeling;
- stuffy nose; or
- blurred vision.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. You may report side effects to FDA at 1-800-FDA-1088.
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Interactions
Before taking terazosin, tell your doctor if you use any other blood pressure medications, especially verapamil (Calan, Covera, Isoptin, Verelan). You may need a dosage adjustment if you take terazosin with other blood pressure medicines.
There may be other drugs that can affect terazosin. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.
Other Names
Hytrin and terazosin
Available Strengths & Dosages
| Route |
Form |
Strength |
| oral |
capsule |
2 mg |
| oral |
capsule |
1 mg |
| oral |
capsule |
5 mg |
| oral |
capsule |
10 mg |
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Disclaimer
Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2004 Cerner Multum, Inc. Version 2.05. Revision date 8/23/04
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