Amlexanox Canker-Sore Film: Four Trial Checks

Before choosing a product for a recurring mouth sore, record when it appeared and whether it resembles previous sores. Bring the label of anything you have tried. These four checks frame a discussion with your dentist or pharmacist.

Who was studied?

A Chinese trial randomized 216 adults with recent minor canker sores to a 2 mg amlexanox adhesive film or vehicle film for five days. Ulcers were no larger than 5 mm. Pregnancy, breastfeeding and ulcers from systemic diseases were excluded. Analyses omitted three nonadherent participants, leaving 108 active-treatment and 105 control patients.¹

What did improvement mean?

On day six, 99 of 108 versus 77 of 105 had at least 30% pain reduction. That response category did not mean complete healing. Multiple outcomes and timepoints, plus a baseline ulcer-size imbalance, limit interpretation.¹

Were tablets equivalent?

The tablet comparison used 104 patients from an earlier study, not a concurrent randomized group. Nonsignificant differences do not establish equivalence. Follow-up cannot establish prevention of future sores. Chinese government grants partly supported the paper.¹

What belongs in care?

FDA² currently lists the US 2 mg amlexanox patch as discontinued. Its record shows an initial approval in 2004. That marketing status does not establish why sales stopped, or availability in another country. Nor does it make a different film, paste or compounded product interchangeable with the Chinese study preparation. Ask a pharmacist to verify the exact product and local availability.²

The NHS³ advises seeing a dentist or GP for an ulcer lasting longer than three weeks, one different from previous sores, or one that bleeds or becomes more painful and red. Other ulcers on the body or painful, swollen joints also warrant assessment. Most mouth ulcers heal within a week or two. A soft toothbrush, softer foods and avoiding very hot or acidic drinks can help with discomfort. A pharmacist can discuss suitable treatments.³

Is It My Breath? places its “Red-Flag List” before routines and rinses. It includes a persistent mouth ulcer, a red or white patch, or a mouth or neck lump. Keep the assessment question alongside the pain-relief question when discussing a sore that has not settled.