Key facts

  • Allergies in Hong Kong are usually perennial, meaning year-round, driven by house dust mites rather than seasonal pollen.
  • Cut the trigger first: hot-wash bedding, use allergen covers on the mattress and pillows, ventilate and run a dehumidifier. No tablet beats removing the mite load.
  • A non-drowsy second-generation antihistamine (such as fexofenadine or bilastine) is the everyday first medicine for sneezing, itch and a runny nose.
  • For a blocked, congested nose, a nasal corticosteroid spray is the most effective option; it works when used daily and builds up over several days.
  • Basic antihistamines are sold over the counter at a registered pharmacy; some stronger or specific options may involve a pharmacist’s advice or a doctor.
  • Ask for the active ingredient and strength, not just the brand you used at home, and confirm a product on the Drug Office database.
  • See a doctor for any wheeze, breathlessness or chest tightness, or symptoms that will not settle with sensible treatment.

Why is Hong Kong so hard on allergies?

Hong Kong allergies tend to be perennial, meaning year-round, rather than seasonal, and the main driver is the house dust mite, not pollen. House dust mites are microscopic, harmless in themselves, and thrive in warm, humid homes with soft furnishings, which describes most flats here for much of the year.

They, far more than pollen, drive the majority of indoor allergy in Hong Kong, a point health insurer Cigna’s Hong Kong guide to dust-mite allergy makes clearly, drawing on local research into how high mite levels run in local households.

Add the city’s roadside air pollution and the dust that circulates through air-conditioning, and you have a nose that is mildly irritated much of the time. The mechanism is the same as classic hay fever: the immune system meets an allergen and releases histamine, which makes the nose itchy, runny and congested. The Hong Kong Drug Office’s overview of oral anti-allergy medicines and the US MedlinePlus page on allergic rhinitis both lay out the basics well.

The same mite exposure can matter to the chest as well as the nose. Wheezing, breathlessness or chest tightness deserves a doctor; a persistent nose problem may warrant allergy testing too. Our guide to eczema and sensitive skin in Hong Kong covers another atopic condition.

What actually relieves allergies in Hong Kong?

Relief works best as a step-up: cut the trigger first, add a non-drowsy antihistamine for sneezing and itch, and use a nasal corticosteroid spray for a blocked nose. Here is the short version before the detail:

OptionBest forNotes
Reduce the triggerEveryone, all the timeHot-wash bedding, mattress and pillow covers, ventilate and dehumidify
Non-drowsy antihistamine tabletSneezing, itch, runny noseSecond-generation types cause far less drowsiness than older ones
Nasal corticosteroid sprayA blocked, congested noseThe most effective option; used daily, builds up over several days
Nasal antihistamine sprayFast nasal symptom reliefWorks quickly on the nose; can be used with a steroid spray

First, cut the exposure, because no tablet beats removing the trigger. Washing bedding hot, putting allergen covers on the mattress and pillows, airing rooms and running a dehumidifier all reduce the mite load that is winding your nose up, as Cigna’s HK guide sets out.

Second, for sneezing, itch and a runny nose, a non-drowsy antihistamine is the everyday workhorse. The second-generation types such as fexofenadine and bilastine, along with cetirizine and loratadine, cause far less drowsiness than the older medicines, which is why the Drug Office steers people towards them. They are easy to take once a day and are a sensible first medicine. You can see the range on our allergy relief category page.

Third, for a genuinely blocked, congested nose, a nasal corticosteroid spray is the most effective treatment there is. Fluticasone, mometasone and beclometasone work on the inflammation in the nose itself, and the key is using them regularly rather than now and then, since they build up over several days. A nasal antihistamine spray such as azelastine adds fast relief and can be used alongside a steroid spray.

One honest note on a medicine you may see mentioned: a doctor sometimes considers montelukast, particularly where asthma is involved. It is not a first choice for allergies on its own, because it carries an FDA boxed warning about serious mental-health effects, and the FDA advises limiting its use in allergic rhinitis to people who cannot use the alternatives. That is a conversation for a doctor, not a self-start.

Where do I buy allergy medicine, and how do I keep a steady supply?

Basic antihistamines are sold over the counter at a registered pharmacy. Stronger or more specific options, a particular nasal corticosteroid or a prescription-strength antihistamine, may involve a pharmacist’s advice or a doctor. That small step is worth it for a problem that is genuinely affecting you.

Because symptoms can run year-round, plan a refill before you run out. You can buy locally or arrange delivery. Ask for the active ingredient and strength, not only a foreign brand name: fexofenadine tablets and mometasone nasal spray treat different symptoms. Our active ingredient pages group brands and generics. Check the product on the Drug Office drug database, and browse by category or respiratory health.

ZoneMD option: ZoneMD lets you compare brand and generic options by ingredient, with licensed pharmacy partners handling dispensing and delivery. A pharmacy should disclose who dispenses, its licence and its prescription process; how ordering works sets out the steps.

Buy from a registered pharmacy showing the “Rx” logo. The Drug Office’s advice on buying medicines says medicines sold in Hong Kong must be registered, including online sales. A genuine pack should be sealed and clearly show the active ingredient, strength, maker, batch number and expiry. A suspiciously cheap price is a warning, not a bargain.

Do and don’t

Do:

  • Cut the trigger first: hot-wash bedding, use allergen covers, ventilate and run a dehumidifier.
  • Ask for the active ingredient and strength, not just a brand name.
  • Start with a non-drowsy second-generation antihistamine for sneezing, itch and a runny nose.
  • Use a nasal corticosteroid spray regularly, not now and then, for a blocked nose.
  • Confirm a product on the Drug Office database and buy from a registered pharmacy.
  • See a doctor for any wheeze or breathlessness, or symptoms that will not settle.

Don’t:

  • Drive when an antihistamine makes you drowsy. The Drug Office says this can happen even with a non-sedating type.
  • Start montelukast for rhinitis yourself. Its FDA boxed warning is why it is reserved for people who cannot use other allergy medicines or did not benefit from them.

Frequently asked questions

Are antihistamines available over the counter in Hong Kong? Basic second-generation antihistamines such as fexofenadine, cetirizine and loratadine are generally sold over the counter at a registered pharmacy. Stronger or more specific options may involve a pharmacist’s advice or a doctor. Ask the pharmacist which local product matches the active ingredient you want.

Which is better for a blocked nose, an antihistamine or a nasal spray? For a genuinely congested nose, a nasal corticosteroid spray is usually more effective than a tablet, but it needs regular daily use to build up. A nasal antihistamine spray adds faster relief and can be used alongside a steroid spray. A pharmacist can help you choose.

Do I need to see a doctor for allergies, or can I manage them myself? Many people manage year-round rhinitis with trigger control, a non-drowsy antihistamine and a nasal steroid spray. See a doctor if there is any wheeze or breathlessness, if symptoms will not settle with sensible treatment, or if they are disrupting your sleep and days.

What should I do next?

Start with the trigger and the symptom that bothers you most. Allergy relief in Hong Kong comes down to recognising that the problem is usually year-round and driven by dust mites and city air, then working up from cutting the trigger to a non-drowsy antihistamine and, for a blocked nose, a regular nasal corticosteroid spray. Learn your active ingredients and keep a steady supply, and see a doctor if there is any wheeze or it will not settle. Browse by active ingredient or by category, see how ordering and delivery work, read our companion guide to eczema and sensitive skin in Hong Kong, the atopic cousin of rhinitis, and for the bigger picture our guide to buying medicine in Hong Kong.

This guide is general information, not medical advice. If your symptoms include any wheeze or breathlessness, or are not settling with sensible treatment, see a doctor.