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Terazosin is used in the treatment of benign prostatic hyperplasia (enlarged prostate) and increased blood pressure

How it works

Terazosin works by relaxing muscle around the bladder exit and prostate gland so urine is passed more easily. lowers blood pressure by relaxing blood vessels.

Common side effects

Dizziness, Rash, Headache, Orthostatic hypotension (sudden lowering of blood pressure on standing), Weakness, Back pain, Pain in extremity, Lightheadedness, Vomiting, Edema, Paresthesia (tingling or pricking sensation), Nausea, Sleepiness, Itching, Diarrhoea, Nervousness, Constipation, Vertigo, Impotence

Available Medicine

Expert advice

  • Seek immediate medical attention if you experience syncope (temporary loss of consciousness caused by a fall in blood pressure) especially in the upright position, along with other postural symptoms such as dizziness after the first dose, first few days of therapy, or restarting the therapy after a brief interruption. Do not panic, you should sit or lie down until you feel better.
  • Consult your doctor immediately if you experience priapism (painful erection of the penis, sustained for hours and unrelieved by sexual intercourse or masturbation), which is an extremely rare but serious side effect, if untreated can lead to permanent inability to have an erection.
  • Inform your doctor that you are on terazosin therapy, if you are to undergo an eye surgery for cataract so as to avoid the complications during cataract surgery.
  • Do not drive or operate machinery as terazosin may make you drowsy or dizzy.
  • Take screening test for the presence of prostate cancer prior to treatment and at regular intervals afterwards, as terazosin is not indicated for symptoms (though similar to BPH) due to prostate cancer.
  • Tell your doctor if you are or planning to become pregnant or are breastfeeding.

Frequently asked questions


Q. Is terazosin a beta blocker or an alpha blocker?
Terazosin belongs to class of medications called alpha-receptor blockers or alpha-blockers

Q. Is terazosin safe?
Terazosin is safe if used at prescribed doses for the prescribed duration as advised by your doctor

Q. Is terazosin a statin or a blood thinner (thin the blood)?
Terazosin is neither a statin nor a blood thinner

Q. Is terazosin a diuretic?
No, terazosin is not a diuretic, it antagonizes the alpha receptors causing relaxation of the smooth muscle tone in the prostate and bladder neck, hence the urine is passed easily in patients with enlarged prostrate

Q. Is terazosin a narcotic?
No, terazosin is not a narcotic

Q. Does terazosin lower heart rate?
No, terazosin is not known to reduce heart rate. Increase in heart rate or irregular heart rate is a common adverse event reported for terazosin

Q. Does Terazosin cause weight gain/ impotence/ tiredness/ constipation and dry mouth?
Weight gain/ tiredness/ constipation and dry mouth are common side effects of terazosin therapy. However is not known to cause impotence. It may rarely cause painful prolonged erections (Priapism), which if untreated may cause impotence

Q. Can I take terazosin with Cialis (tadalafil)?
Please follow your doctor's advice before taking these medications with terazosin. As combining Cialis (tadalafil) with terazosin can lower your blood pressure and increase the risk of dizziness, lightheadedness, fainting, flushing, headache, and nasal congestion

Q. Can I take terazosin with Flomax (tamsulosin)?
Terazosin and Flomax (tamulosin) are both used for the symptomatic treatment of benign prostatic hyperplasia. Please follow your doctor's advice before taking any medications when on treatment with terazosin

Q. Does terazosin lower Prostate specific antigen (PSA)?
No, terazosin does not lower PSA.

Content on this page was last updated on 19 January, 2017, by Dr. Varun Gupta (MD Pharmacology)