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Terazosin

Medication alpha-1 blocker other
Aka: Hytrin
Brands seen in Singapore: Apo-Terazosin, Terasin, Hytrin
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Enlarged prostate symptoms · also high blood pressure
When to take
SG label: maximal bph benefit appears after 3–6 months
Take with
With or without food · alcohol raises dizziness
Pros & cons
Pros
  • HealthHub: relaxes prostate and bladder-exit muscles
  • SG label: one drug covers bph and blood pressure
  • Three SG brands: hytrin, terasin and apo-terazosin
Cons
  • Dizziness, light-headedness or fainting are common
  • HealthHub: drowsiness may affect driving
  • Floppy iris can complicate cataract surgery
Sources
  1. HSA — Listing of Registered Therapeutic Products (data.gov.sg d_767279312753558cbf19d48344577084), Forensicclassification column; read from the cached copy at /tmp/hsa_all.json and filtered locally, not re-fetched · read 2026-08-27
    what it says
    “APO-TERAZOSIN TABLET 2 mg SIN12672P; TERASIN TABLET 2 mg SIN11600P; HYTRIN TABLET 1/2/5 mg SIN11674P, SIN11675P, SIN11676P — all 5 terazosin rows read Prescription Only (ATC G04CA03; the Apo-Terazosin row carries no ATC code)”
  2. MOH National Drug Formulary (Singapore) — HYTRIN TABLET 1 MG [SIN11674P], product information · read 2026-08-27
    what it says
    “TERAZOSIN HYDROCHLORIDE 1.187 MG EQV TO TERAZOSIN - 1 MG … Forensic Classification PRESCRIPTION ONLY MEDICINES … Anatomical Therapeutic Chemical (ATC) code G04CA03 … Prescription-only Medicines with Exemptions for Supply without Prescription NA”
  3. MOH National Drug Formulary (Singapore) — HYTRIN [SIN11674P], INDICATIONS · read 2026-08-27
    what it says
    “Hytrin (terazosin hydrochloride) is indicated for the relief of the manifestations of mild to moderate benign prostatic hyperplasia (BPH) … Terazosin is also indicated in the treatment of hypertension.”
  4. MOH National Drug Formulary (Singapore) — HYTRIN [SIN11674P], DOSAGE AND ADMINISTRATION · read 2026-08-27
    what it says
    “1 mg at bedtime is the starting dose for all patients, and this dose should not be exceeded … The usual recommended dose range is 5 to 10 mg administered once a day”
  5. HealthHub (MOH Singapore) — Terazosin, medication information leaflet, uses (article last reviewed 13 May 2026) · read 2026-08-27
    what it says
    “Terazosin belongs to a group of medications known as alpha-1 blockers. It is used to treat benign prostatic hyperplasia … The medication works by relaxing the muscles of the prostate gland and bladder exit to help relieve these symptoms.”
  6. HealthHub (MOH Singapore) — Terazosin, administration · read 2026-08-27
    what it says
    “You may take this medication with or without food. The first tablet of a new dose should be taken at bedtime, and subsequently at the same time each day.”
  7. HealthHub (MOH Singapore) — Terazosin, precautions · read 2026-08-27
    what it says
    “You have heart problems. You ever feel dizzy or faint when you stand up, or if you have ever fainted after passing urine.”
  8. HealthHub (MOH Singapore) — Terazosin, common side effects · read 2026-08-27
    what it says
    “Dizziness, light-headedness or fainting … when taking the medication for the first time, restarting treatment, or starting to take a higher dose … Drowsiness — May affect your ability to drive and use machinery.”
  9. HealthHub (MOH Singapore) — Terazosin, food and medication to avoid · read 2026-08-27
    what it says
    “Avoid drinking alcohol as it may increase the risk of dizziness, light-headedness or drowsiness. Inform your healthcare professional if you are taking or intend to take any other medication, supplements, traditional medications or herbal remedies.”
  10. MOH National Drug Formulary (Singapore) — HYTRIN [SIN11674P], INDICATIONS: use in combination · read 2026-08-27
    what it says
    “It can be used alone or in combination with other antihypertensive agents such as diuretics or beta-adrenergic blocking agents.”
  11. MOH National Drug Formulary (Singapore) — HYTRIN [SIN11674P], DOSAGE AND ADMINISTRATION: hypertension ceiling · read 2026-08-27
    what it says
    “some patients may benefit from doses as high as 20 mg per day. Doses over 20 mg do not appear to provide further blood pressure effect and doses over 40 mg have not been studied.”
  12. MOH National Drug Formulary (Singapore) — HYTRIN [SIN11674P], DOSAGE AND ADMINISTRATION: time to benefit in BPH · read 2026-08-27
    what it says
    “Maximal benefit appears to occur after 3 to 6 months of treatment, but it appears that there is little to be gained by continuing treatment for more than 6 months if there has been no clinical response.”
  13. HealthHub (MOH Singapore) — Terazosin, precautions: cataract surgery · read 2026-08-27
    what it says
    “You are undergoing cataract (cloudiness of the lens) eye surgery … The pupil may dilate poorly and the iris (the coloured part of the eye) may become floppy during the operation.”
  14. HealthHub (MOH Singapore) — Terazosin, precautions: PDE-5 inhibitors · read 2026-08-27
    what it says
    “You are taking medications belonging to PDE-5 Inhibitors class such as Sildenafil, Tadalafil , Avanafil or Vardenafil … you should be on a regular daily dose of your alpha1-blocker medications … before you start medications for erectile dysfunction.”
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Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.