Home Symptoms Canker Sores

Canker Sores — what to take?

Canker sores are small, painful ulcerations on the oral mucosa, with a white-yellowish base and an erythematous halo. They heal spontaneously within 7-14 days. Causes: stress, trauma, deficiencies (B12, iron, folate), genetic factors.

Also known as: aphthous stomatitis oral ulcers mouth ulcer
5 recommended OTC medicines
8,928 pharmacies available

In short: Canker sores (aphthous ulcers) are small, painful ulcers on the lining of the mouth, with a whitish-yellow base and a red halo, which usually heal on their own within one to two weeks; they tend to appear against a background of stress, minor trauma, or deficiencies of vitamin B12, iron, and folate. For the pain, OTC options include benzydamine oral gel, hyaluronic acid spray, or chlorhexidine mouthwash, whose prices you can compare on HartaFarmacii across the major pharmacies (Dr. Max, Tei, Catena, HelpNet), with prices updated daily. This information is for guidance only and does not replace a medical consultation; see a doctor if a canker sore fails to heal after more than three weeks.

Data verified on from public sources (OpenStreetMap, chain websites, ANM/MS) — updated daily.

OTC — no prescription

What can you take for canker sores?

Informational only — HartaFarmacii is not an approved medical site. Talk to your doctor or pharmacist before taking any medicine. Don't self-medicate. Emergencies: 112.

When to see a doctor

If any of these signs appear, see a doctor — OTC treatment is not enough:

  • Canker sores lasting over 3 weeks without healing
  • Very frequent canker sores (monthly)
  • Canker sores with fever, lymphadenopathy
  • Suspected celiac disease, Crohn's
  • Canker sores in a single location, with induration

Types

Minor — under 1 cm, the most common, healing in 7-10 days, without scarring.

Major — over 1 cm, deep, painful, 2-6 weeks healing, may scar.

Herpetiform — multiple small ulcerations, clustered.

OTC Treatment

Topical gels with benzydamine (Tantum Verde gel) — anti-inflammatory, analgesic.

With local corticosteroids — hydrocortisone orabase — accelerates healing.

Mouthwash with chlorhexidine (Corsodyl) — reduces secondary infection.

Spray with hyaluronic acid (Gengigel, Aftamed) — accelerates healing.

Gels with lidocaine 2% — local anesthetic for comfort.

Supplements — B12, folic acid, iron in confirmed deficiency (recurrent canker sores often improve with supplements).

Care Measures

  • Avoid spicy, acidic, salty foods.
  • Toothpaste without sodium lauryl sulfate (SLS) — can aggravate.
  • Gentle brushing, with a soft toothbrush.
  • Stress reduction.
  • Impeccable oral hygiene.

When It Is a Warning Sign

Very frequent or persistent canker sores, recurrent major canker sores, association with systemic symptoms (fever, lymphadenopathy, arthralgias) — may suggest systemic diseases: Behçet, celiac disease, Crohn's, PFAPA syndrome, HIV infection. Requires medical evaluation.

Medical disclaimer: the information in this guide is for informational purposes only and does not replace the advice of a doctor or pharmacist. For diagnosis and treatment, consult a health professional.

Medicines compared

Medicines used for canker sores

This list is for guidance only, generated automatically from the DCI/category match. It is not a medical recommendation — consult your doctor before starting any treatment.

This list is not a medical recommendation. Consult your doctor or pharmacist.

Night-time, weekends, public holidays

24/7 pharmacies for canker sores

Canker Sores doesn't keep office hours. If you need a medicine at 2 a.m. or at the weekend, open the map with the 24/7 filter switched on and look for the nearest on-duty pharmacy. Large cities have dozens of pharmacies open around the clock — below you have direct access to the list for each city, with address, phone number and verified opening hours.

Call before you set off, especially at night — on-duty rotas change and stock of some prescription medicines can be limited between deliveries.

Search the pharmacy

Medicine categories for canker sores

Step by step

How to find a pharmacy fast for canker sores

Open the interactive map and allow location access — you will immediately see pharmacies sorted by distance, each with its opening hours and a one-tap route in Google Maps. If it is night or the weekend, switch on the 24/7 filter to keep only the on-duty ones. For canker sores many medicines are available over the counter, so you can go straight to the pharmacy without a prescription, but check availability on the price comparator first to avoid wasted trips.

If you have a preferred active substance (for example paracetamol or ibuprofen), search for it in the comparator before you leave — you will see which chain has it cheapest near you and whether it is in stock. If you have a repeat prescription, save your preferred pharmacy as a favourite in the app and turn on opening-hours notifications — it saves unnecessary trips, especially if treatment for canker sores goes on for a while.

See also

Related symptoms and conditions

Symptom

Sore throat

A sore throat (odynophagia) usually arises from a viral infection (80-90% of cases) or, less often, a bacterial one (beta-hemolytic streptococcus). Most episodes resolve within 5-7 days with symptomatic treatment.

 Symptom

Toothache

Toothache has multiple causes: cavity, pulpitis, abscess, gingivitis, tooth fracture, bruxism. It requires a visit to the dentist — OTC treatment is only temporary.

Frequently asked questions

What else would you like to know?

What causes canker sores?
Multifactorial etiology — stress, trauma (biting), nutritional deficiencies, hormonal factors, genetic factors, foods (pineapple, citrus, nuts), SLS toothpaste.
The most effective remedy?
Topical corticosteroid gel (hydrocortisone orabase) — shortens healing by 2-3 days. Combined with hyaluronic acid for repair.
Are they contagious?
No — simple canker sores are not. Unlike oral herpes (easily confused) which is contagious.
Frequent canker sores — what investigations?
Complete blood count, ferritin, B12, folate, anti-transglutaminase (celiac disease), blood glucose. With high frequency or systemic symptoms — specialist consultation.

See also

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