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Fexofenadine

Medication second-generation antihistamine allergy
Aka: Telfast, Fexodin, Allegra
Brands seen in Singapore: Telfast, Fexodin, Fexofen, Telfast D
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
Hay fever, hives, itch, runny nose and other allergies
When to take
Once daily per label · when symptoms need it (HealthHub)
Take with
Water · not fruit juice; 120/180 mg tablets before a meal
Pros & cons
Pros
  • SG 120 mg is general sale list — sold beyond pharmacies
  • NHS: less likely to make you sleepy than some others
  • HealthHub: generally well tolerated
Cons
  • 'non-drowsy' but some still feel quite sleepy (NHS)
  • Fruit juice and antacids cut how much is absorbed
  • SG 180 mg strength is prescription only (HSA register)
Sources
  1. HSA — Listing of Registered Therapeutic Products (open dataset on data.gov.sg, resource d_767279312753558cbf19d48344577084, pulled via datastore_search API; all 7 fexofenadine rows read) · read 2026-08-27
    what it says
    “TELFAST TABLET 120 mg · FEXOFENADINE HCl · General Sale List — FEXODIN FILM COATED TABLET 120MG · General Sale List — TELFAST TABLET 180 mg · Prescription Only — TELFAST D TABLET · Pharmacy Only”
  2. HSA — List of reclassified medicines (forensic classification definitions: POM / P / GSL) · read 2026-08-27
    what it says
    “General Sale List Medicine (GSL): A therapeutic product that can be obtained from any retailer … is indicated for self-limiting, common and easily recognised ailments, and is reasonably safe to be used without medical supervision”
  3. HealthHub (MOH Singapore) — Fexofenadine medication information leaflet (article last reviewed 7 July 2026) · read 2026-08-27
    what it says
    “Fexofenadine is used to relieve or prevent symptoms of hives, hay fever, itch, runny nose and other types of allergies … Do not exceed the maximum dose as stated on the medicine label given to you”
  4. HealthHub (MOH Singapore) — Fexofenadine leaflet, 'how should I take' and side-effects sections (same page) · read 2026-08-27
    what it says
    “You may take the medication when necessary to relieve your symptoms … Fexofenadine is generally well tolerated … You are pregnant, planning to become pregnant, or breastfeeding”
  5. HealthHub (MOH Singapore) — Fexofenadine leaflet, food and medication interactions section (same page) · read 2026-08-27
    what it says
    “Separate administration of Fexofenadine with aluminium or magnesium containing antacids by at least 2 hours … Do not take grapefruit, orange, or apple juice together with this medication as fruit juices may reduce the amount of Fexofenadine in your body”
  6. NHS — About fexofenadine (page last reviewed 22 April 2025) · read 2026-08-27
    what it says
    “Fexofenadine is a non-drowsy antihistamine. It's less likely to make you feel sleepy than some other antihistamines … You can also buy 120mg fexofenadine tablets for adults and children aged 12 years and over from pharmacies and supermarkets”
  7. NHS — About fexofenadine, 'Key facts' box (same page) · read 2026-08-27
    what it says
    “Fexofenadine is classed as a non-drowsy antihistamine, but some people still find it makes them feel quite sleepy … It's best not to drink alcohol while you're taking fexofenadine as it can make you feel sleepy”
  8. NHS — How and when to take fexofenadine (page last reviewed 22 April 2025) · read 2026-08-27
    what it says
    “The usual dose for treating hay fever is: 120mg, taken once a day for adults and children aged 12 years and over … The usual dose for treating hives is 180mg once a day … take them before a meal”
  9. NHS — Side effects of fexofenadine (page last reviewed 22 April 2025) · read 2026-08-27
    what it says
    “Common side effects of fexofenadine happen in more than 1 in 100 people … Feeling sick … Feeling sleepy … Headaches … Feeling dizzy … Do not drive, ride a bike or operate tools or machinery until you feel better”
  10. DailyMed / FDA — ALLEGRA ALLERGY (fexofenadine HCl) film-coated tablet, OTC Drug Facts '24 Hour Directions' (Chattem; label updated 14 April 2026) · read 2026-08-27
    what it says
    “Allegra 24 Hour Directions: adults and children 12 years of age and over take one 180 mg tablet with water once a day; do not take more than 1 tablet in 24 hours”
  11. DailyMed / FDA — ALLEGRA ALLERGY, OTC Drug Facts '12 Hour Directions' (same label) · read 2026-08-27
    what it says
    “Allegra 12 Hour Directions: adults and children 12 years of age and over take one 60 mg tablet with water every 12 hours; do not take more than 2 tablets in 24 hours”
  12. DailyMed / FDA — ALLEGRA ALLERGY, OTC Drug Facts 'Warnings' (same label) · read 2026-08-27
    what it says
    “Ask a doctor before use if you have kidney disease … adults 65 years of age and older: ask a doctor … If pregnant or breast-feeding, ask a health professional before use”
  13. DailyMed / FDA — ALLEGRA ALLERGY, OTC Drug Facts 'When using this product' (same label) · read 2026-08-27
    what it says
    “When using this product … do not take more than directed … do not take at the same time as aluminum or magnesium antacids … do not take with fruit juices (see Directions)”
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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.