{"ok":true,"entry":{"slug":"tamsulosin","kind":"medication","name":"tamsulosin","aliases":["Harnal","Flomax"],"brands_sg":["Harnal OCAS","Tamsin","Tasulose","Tamsulosin-Teva"],"class":"alpha-1 blocker","tags":["other"],"use_for":"prescribed for urinary symptoms of an enlarged prostate","use_after":"healthhub: first tablet of a new dose at bedtime","use_duration":null,"take_with":"healthhub: with or without food; not crushed or chewed","pros":["healthhub: relaxes prostate and bladder-exit muscles","fda: 0.4 mg once daily is the recommended bph dose","sg register: single-ingredient tablets are all 0.4 mg"],"cons":["healthhub: dizziness, light-headedness or fainting","fda: abnormal ejaculation among common adverse events","fda: floppy iris syndrome during cataract surgery"],"dose_note":"the us fda label for tamsulosin hydrochloride capsules states '0.4 mg once daily is recommended as the dose for the treatment of the signs and symptoms of BPH' and that for people who do not respond after 2 to 4 weeks 'the dose … can be increased to 0.8 mg once daily' — 0.8 mg once daily is the ceiling the label carries. every sg-registered single-ingredient product is a 0.4 mg prolonged-release tablet. in singapore the prescriber sets the dose.","dosage":null,"ul_status":null,"sg_class":"prescription-only","cautions":["cataract or glaucoma surgery planned (healthhub)","fainting or dizziness on standing (healthhub)","sulfonamide allergy, or heart problems (healthhub)","fda: prostate cancer screening before and during use"],"clashes":[{"src":["fda_tam_di"],"note":"fda: the 0.4 mg capsule should not be used with strong cyp3a4 inhibitors","with":"strong cyp3a4 inhibitors (ketoconazole)"},{"src":["hh_tam_prec","fda_tam_di"],"note":"healthhub and fda: can cause dizziness or symptomatic low blood pressure","with":"pde-5 inhibitors (sildenafil, tadalafil)"},{"src":["fda_tam_warn"],"note":"fda: should not be used in combination with other alpha adrenergic blocking agents","with":"other alpha blockers"},{"src":["fda_tam_warn"],"note":"fda: exercise caution with concomitant administration of warfarin","with":"warfarin"},{"src":["hh_tam_food"],"food":true,"note":"healthhub: may increase the risk of dizziness, light-headedness or drowsiness","with":"alcohol"}],"sources":[{"id":"hsa_register","url":"https://data.gov.sg/datasets/d_767279312753558cbf19d48344577084/view","label":"HSA — Listing of Registered Therapeutic Products (data.gov.sg open dataset, 5,511 rows, cached in full and filtered locally)","quote":"All 8 registered tamsulosin products read Forensicclassification 'Prescription Only'. The four single-ingredient ones are 0.4 mg 'TABLET, FILM COATED, EXTENDED RELEASE': SIN13696P Harnal OCAS · SIN15476P TAMSIN · SIN15573P TASULOSE · SIN16191P TAMSULOSIN-TEVA; the other four are dutasteride combinations.","accessed":"2026-08-27"},{"id":"nhs_tam_index","url":"https://www.nhs.uk/medicines/tamsulosin/","label":"NHS Medicines A-Z — Tamsulosin (index page, UK brand names)","quote":"Tamsulosin - Brand names: Contiflo XL, Faramsil MR, Flomaxtra XL, Pamsvax XL, Tabphyn MR … Find out how tamsulosin treats symptoms of an enlarged prostate and kidney stones, and how to take it.","accessed":"2026-08-27"},{"id":"hh_tam_uses","url":"https://www.healthhub.sg/medication-devices-and-treatment/medications/tamsulosin","label":"HealthHub (Pharmaceutical Society of Singapore) — Tamsulosin: what is this medication for","quote":"Tamsulosin 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.","accessed":"2026-08-27"},{"id":"hh_tam_howto","url":"https://www.healthhub.sg/medication-devices-and-treatment/medications/tamsulosin","label":"HealthHub — Tamsulosin: how should I take this medication","quote":"You may take this medication with or without food. Do not crush or chew the tablet as this can affect the release of medication into your body. The first tablet of a new dose should be taken at bedtime","accessed":"2026-08-27"},{"id":"hh_tam_prec","url":"https://www.healthhub.sg/medication-devices-and-treatment/medications/tamsulosin","label":"HealthHub — Tamsulosin: what precautions should I take","quote":"Inform your healthcare professional if: You are allergic … has sulfonamide allergy … You have heart problems; You ever feel dizzy or faint when you stand up … You are undergoing cataract (cloudiness of the lens) eye surgery","accessed":"2026-08-27"},{"id":"hh_tam_side","url":"https://www.healthhub.sg/medication-devices-and-treatment/medications/tamsulosin","label":"HealthHub — Tamsulosin: common side effects","quote":"Dizziness, light-headedness or fainting … When taking the medication for the first time, restarting treatment, or starting to take a higher dose, these side effects may occur … Drowsiness … May affect your ability to drive","accessed":"2026-08-27"},{"id":"hh_tam_food","url":"https://www.healthhub.sg/medication-devices-and-treatment/medications/tamsulosin","label":"HealthHub — Tamsulosin: what food or medication should I avoid","quote":"Avoid drinking alcohol as it may increase the risk of dizziness, light-headedness or drowsiness.","accessed":"2026-08-27"},{"id":"fda_tam_dose","url":"https://api.fda.gov/drug/label.json?search=openfda.generic_name:%22tamsulosin%22&limit=3","label":"US FDA label — tamsulosin hydrochloride capsules, section 2 Dosage and Administration, via openFDA drug/label.json","quote":"Tamsulosin hydrochloride capsules 0.4 mg once daily is recommended as the dose for the treatment of the signs and symptoms of BPH … the dose of tamsulosin hydrochloride capsules can be increased to 0.8 mg once daily","accessed":"2026-08-27"},{"id":"fda_tam_warn","url":"https://api.fda.gov/drug/label.json?search=openfda.generic_name:%22tamsulosin%22&limit=3","label":"US FDA label — tamsulosin hydrochloride capsules, section 5 Warnings and Precautions, via openFDA drug/label.json","quote":"Should not be used in combination with other alpha adrenergic blocking agents … Exercise caution with concomitant administration of warfarin … Advise patients about the possibility and seriousness of priapism","accessed":"2026-08-27"},{"id":"fda_tam_ae","url":"https://api.fda.gov/drug/label.json?search=openfda.generic_name:%22tamsulosin%22&limit=3","label":"US FDA label — tamsulosin hydrochloride capsules, section 6 Adverse Reactions, via openFDA drug/label.json","quote":"The most common adverse events (≥2% of patients and at a higher incidence than placebo) with the 0.4 mg dose or 0.8 mg dose were headache, dizziness, rhinitis, infection, abnormal ejaculation, asthenia, back pain","accessed":"2026-08-27"},{"id":"fda_tam_di","url":"https://api.fda.gov/drug/label.json?search=openfda.generic_name:%22tamsulosin%22&limit=3","label":"US FDA label — tamsulosin hydrochloride capsules, section 7 Drug Interactions, via openFDA drug/label.json","quote":"Tamsulosin hydrochloride capsules 0.4 mg should not be used with strong inhibitors of CYP3A4 (e.g., ketoconazole) … Concomitant use of PDE5 inhibitors with tamsulosin can potentially cause symptomatic hypotension.","accessed":"2026-08-27"},{"id":"fda_tam_warn2","url":"https://api.fda.gov/drug/label.json?search=openfda.generic_name:%22tamsulosin%22&limit=3","label":"US FDA label — tamsulosin hydrochloride capsules, section 5 Warnings and Precautions (cataract surgery, prostate cancer screening), via openFDA drug/label.json","quote":"Intraoperative Floppy Iris Syndrome has been observed during cataract and glaucoma surgery in some patients … Advise patients to be screened for the presence of prostate cancer prior to treatment and at regular intervals afterwards","accessed":"2026-08-27"}],"brand_certs":null,"updated_at":"2026-08-29T16:16:33.302383+08:00"},"disclaimer":"kozen-x is not a medical device and does not give medical advice. it lists what published sources have written down. absence of a record is not the same as safe."}