Topical Corticosteroids in Oral Medicine
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Direct answer
Concentration decides potency in topical corticosteroids, and oral medicine runs the ladder from mild hydrocortisone (0.5-1 per cent) through the classic triamcinolone acetonide 0.1 per cent in Orabase to the potent fluocinolone 0.05 per cent, betamethasone 0.05 per cent and very potent clobetasol propionate 0.05 per cent, with dexamethasone 0.5 mg per 5 mL elixir and prednisolone 5 mg soluble tablets used as swish-and-spit rinses for widespread disease. The indications are the immunologically mediated mucosal diseases — recurrent aphthous stomatitis, erosive and atrophic lichen planus, mucous membrane pemphigoid, lichenoid reactions and pemphigus as an adjunct. Application discipline governs success: a thin film after meals, two to four times daily, nothing by mouth for 30 minutes, with antifungal cover, because oral candidosis is the commonest adverse effect of treating a mouth with steroids.
What you must remember
- Potency ladder to recite: hydrocortisone 0.5-1 per cent (mild); triamcinolone acetonide 0.1 per cent in Orabase (moderate — the traditional first choice); fluocinolone acetonide 0.05 per cent and betamethasone 0.05 per cent (potent); clobetasol propionate 0.05 per cent (very potent, reserved for refractory erosive disease).
- Rinse formulations: dexamethasone elixir 0.5 mg per 5 mL and prednisolone 5 mg dissolved in water — swished for several minutes then spat, suiting widespread or bilateral disease that a fingertip cannot reach.
- Vehicle logic: Orabase (carboxymethylcellulose-based) adheres the drug to wet mucosa, prolonging contact that ointments designed for skin cannot achieve — a favourite viva reason.
- Application rules: after meals and oral hygiene, two to four times daily, thin film applied with a clean finger, no eating or drinking for 30 minutes; treatment courses are reviewed rather than open-ended.
- Indications by first intent: recurrent aphthous stomatitis, erosive/atrophic lichen planus, mucous membrane pemphigoid, lichenoid reactions — with pemphigus vulgaris managed systemically, topical therapy only adjunctive.
- Adverse effects in the mouth: candidosis (commonest — prophylactic topical antifungal or concurrent nystatin), mucosal atrophy and telangiectasia with prolonged potent use; systemic absorption and adrenal suppression are minimal at these doses but spoken of in the exam.
- Steroid-sparing step: topical tacrolimus 0.1 per cent ointment or ciclosporin rinses when potent steroids fail or cause atrophy — effective, off-label in many settings, and worth naming.
Climbing the ladder for one erosion
A 52-year-old woman with biopsy-proven erosive lichen planus has sore buccal erosions on both sides. Step one: confirmation — histology and clinical pattern already documented; topical therapy is appropriate first-line. Step two: start moderate — triamcinolone 0.1 per cent in Orabase applied thrice daily after meals for two to four weeks, with nystatin suspension concurrently because the steroid will invite Candida onto a wet, eroded surface. Step three: reassess — partial response escalates to clobetasol 0.05 per cent ointment in Orabase or a dexamethasone rinse for the widespread buccal and gingival involvement, again under antifungal cover. Step four: if erosions persist or mucosal atrophy appears, add systemic prednisolone short-course for control then taper, and introduce topical tacrolimus 0.1 per cent as the steroid-sparing maintenance. Step five: maintenance — caries and candidosis surveillance, since a steroid-treated, xerostomic mouth decompensates quietly. Every rung of the potency ladder, each with its percentage, is walked in this single patient — which is why she is the exam's recurring vignette.
Where students slip
The potency ordering is the planted trap: candidates who place triamcinolone 0.1 per cent above clobetasol 0.05 per cent have ranked by number rather than by pharmacology — concentration comparisons across molecules are meaningless; the ladder itself is the fact. The second slip is application doctrine: "after meals, nothing by mouth 30 minutes" is the expected phrase, and omitting the antifungal cover while reciting the regimen answers half the question. The third is preparation confusion — applying a skin ointment to mucosa without an adhesive vehicle and expecting prolonged contact — the Orabase rationale is precisely the viva point. Finally, overcalling systemic risk: adrenal suppression from oral topical therapy is minimal at standard doses, and the honest answer names candidosis as the realistic harm, with systemic effects as a caveat rather than a contraindication.
Frequently asked questions
Rank the topical corticosteroids used orally by potency.
Hydrocortisone 0.5-1 per cent (mild), triamcinolone 0.1 per cent (moderate), fluocinolone 0.05 per cent and betamethasone 0.05 per cent (potent), clobetasol propionate 0.05 per cent (very potent).
How are topical steroids applied to oral lesions?
A thin film after meals, two to four times daily, onto clean mucosa with nothing by mouth for 30 minutes afterwards; adhesive vehicles like Orabase prolong contact.
What is the commonest adverse effect of oral topical steroids?
Candidosis — hence concurrent or prophylactic topical antifungal therapy during treatment courses.
Which diseases are first-line indications for oral topical corticosteroids?
Recurrent aphthous stomatitis, erosive and atrophic lichen planus, mucous membrane pemphigoid and oral lichenoid reactions; pemphigus requires systemic therapy with topicals as adjuncts.
What alternatives exist when topical steroids fail?
Topical tacrolimus 0.1 per cent ointment or ciclosporin rinses as steroid-sparing options, with systemic immunosuppression for refractory disease.