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Topical macrolide antibiotic (anti-acne)

Erythromycin 2% Topical

Brand names: Stiemycin (2% solution), Zineryt (erythromycin 4% + zinc acetate 1.2%)

Topical erythromycin is a macrolide antibacterial solution or gel applied to the skin for mild-to-moderate inflammatory acne vulgaris.

Auto-extracted from the source labelling — not yet independently clinician-verified. These values were distilled from the UK SPC (or the US label where noted) but have not had a clinician sign-off. Confirm against the current SmPC before prescribing.

Adult dose

Dose: Apply over the affected areas twice a day (morning and evening) after the skin is thoroughly washed with warm water and soap and patted dry (erythromycin topical solution 2%).
Route: Topical (2% cutaneous solution) - 'This medication should be applied with applicator top. If fingertips are used, wash hands after application.'
Frequency: Twice a day (morning and evening). 'Drying and peeling may be controlled by reducing the frequency of applications.'
SCOPE: this is the page's primary product, route and indication - topical erythromycin 2% for acne - and the strength is pinned by the product itself ('Erythromycin topical solution, 2%'). The label states 'Acne lesions on the face, neck, shoulders, chest, and back may be treated in this manner.' NO MAXIMUM has been entered: the label states no quantity ceiling, no maximum daily amount and no treated-area limit, so nothing in this bundle qualifies as an absolute cap. This bundle covers ONLY the plain 2% solution; the UK combination product (erythromycin with zinc acetate) is a different formulation with its own SPC and is not sourced here - do not carry a combination regimen across without quantifying both components from that product's own label. PAEDIATRIC: paedDose is deliberately null because the label states 'Safety and effectiveness of this product in pediatric patients have not been established.' Verify any under-18 use against a children's formulary.

Dose adjustments

Renal

Not addressed in this label - the fetched US prescribing information for the topical 2% solution contains no renal-impairment dosing statement.

Hepatic

Not addressed in this label - the fetched US prescribing information for the topical 2% solution contains no hepatic-impairment dosing statement.

Dose auto-extracted from US FDA prescribing information (openFDA / DailyMed) — cross-check; US labelling may differ from UK — not yet clinician-verified. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • Hypersensitivity to any of its components - 'Erythromycin topical solution, 2% is contraindicated in those individuals who have shown hypersensitivity to any of its components' (US label, CONTRAINDICATIONS)

Side effects

  • Local reactions reported occasionally: peeling, dryness, itching, erythema and oiliness (US label, ADVERSE REACTIONS)
  • Irritation of the eyes and tenderness of the skin have also been reported with topical use of erythromycin
  • Generalized urticarial reactions possibly related to the use of erythromycin, which required systemic steroid therapy, have been reported

Monitoring

  • Local tolerance at the application site - 'Drying and peeling may be controlled by reducing the frequency of applications' (US label, DOSAGE AND ADMINISTRATION)
  • Watch for eye irritation and skin tenderness, both reported with topical erythromycin (ADVERSE REACTIONS)
  • Stop and seek advice if a generalized urticarial reaction occurs - such reactions have required systemic steroid therapy (ADVERSE REACTIONS)

Clinical monograph

How it works

Applied locally it inhibits bacterial protein synthesis by binding the 50S ribosomal subunit, suppressing Cutibacterium acnes, and also has a local anti-inflammatory effect.

Prescribing in practice

  • To limit bacterial resistance, topical erythromycin should be combined with benzoyl peroxide rather than used as prolonged antibiotic monotherapy, and treatment courses kept time-limited.
  • Avoid concurrent use of other topical or oral antibiotics from a different class to reduce selection of resistant organisms.
  • Apply to the whole affected area rather than spot-treating, and avoid the eyes, mouth and mucous membranes.

Monitoring

No laboratory monitoring is needed; review acne response and local tolerability, and reassess the need to continue to avoid resistance.

Counselling the patient

  • Apply a thin layer to the entire affected area of clean, dry skin, not just to individual spots.
  • Use any benzoyl peroxide product as advised to keep the treatment working and reduce resistance.
  • Improvement may take several weeks; mild dryness or stinging can occur.

Evidence & guidelines

Topical antibiotics combined with benzoyl peroxide are recommended for acne in NICE guidance, which advises against antibiotic monotherapy to limit resistance.

Reference: BAD Acne Guidelines 2021; NICE CG184; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. The structured dose values shown have been reviewed by a clinician. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.

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