Synopsis
Use an oral tetracycline only when inflammatory acne warrants systemic treatment, combine it with effective non-antibiotic topical care, review at twelve weeks and stop at the earliest appropriate point.
- Reserve oral antibiotics for moderate-to-severe inflammatory acne; comedonal acne alone needs follicular topical therapy, not systemic antibacterial exposure.
- Pair oral lymecycline or doxycycline with adapalene–benzoyl peroxide or azelaic acid; never use an oral acne antibiotic alone.
- Do not combine an oral antibiotic with topical clindamycin or another topical antibiotic, because this adds resistance pressure without being a NICE regimen.
- Set a twelve-week review when prescribing: indication, companion topical, planned stop decision and safety advice should be visible in the record.
- If acne is clear at twelve weeks, stop the antibiotic and continue the topical; if improved but not clear, consider at most twelve further weeks before another review.
- Treatment continuing beyond six months should be exceptional, reviewed every three months and stopped as soon as possible.
- Tetracyclines are unsuitable in pregnancy, breastfeeding and children under 12, and must not overlap with isotretinoin because of intracranial-hypertension risk.
- Failure after an adherent oral-antibiotic-containing course in moderate-to-severe acne is a specialist referral criterion, not an invitation to cycle indefinite antibiotics.
- A later relapse does not automatically justify the same oral prescription: re-grade inflammation and scars, review maintenance use and reconsider specialist need before restarting antimicrobial exposure.
Key red flags
Severe headache with visual disturbance, painful swallowing or chest pain, a widespread blistering eruption, jaundice, severe diarrhoea, pregnancy exposure, rapidly worsening nodules or acute mental-health risk requires prompt assessment and medicine review.
New odynophagia, dysphagia or retrosternal pain during doxycycline therapy suggests pill oesophagitis and requires prompt review of the medicine and complications.
Persistent severe headache, pulsatile tinnitus, nausea, diplopia or visual obscurations during tetracycline exposure needs urgent assessment, particularly if isotretinoin has overlapped.
Investigation priorities
Verify that expected systemic benefit justifies antibiotic exposure.
Management branches
Moderate-to-severe inflammatory acne is confirmed and an oral tetracycline is appropriate.
- Check pregnancy, breastfeeding, age, interactions, organ impairment, prior courses and scar trajectory, then select once-daily lymecycline or doxycycline.
- Pair it with fixed adapalene–benzoyl peroxide or azelaic acid, removing every topical antibiotic and explaining administration, photosensitivity and serious adverse symptoms.
- Prescribe an initial twelve-week course with the review date and intended stopping logic documented from the outset.