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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
RapidMLAMSRAGP

Biologic and small-molecule treatment principles

Essential points for quick revision.

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Serious infection, thrombosis or hypersensitivity

Sepsis, disseminated zoster or HSV, active tuberculosis, severe opportunistic infection, anaphylaxis, new focal neurology, acute chest pain, stroke symptoms, unilateral leg swelling or sudden breathlessness during targeted treatment requires emergency assessment.

Action: Withhold the implicated treatment, stabilise and investigate through the sepsis, allergy, neurological, arterial or venous thrombosis pathway, document exact agent, brand and last dose, and obtain urgent dermatology and infection, haematology or relevant organ-specialist advice.

Synopsis

Select targeted dermatology treatment through disease-specific NICE pathways, screen infection, vaccination, cardiovascular, malignancy and reproductive risk, match mechanism to comorbidity, and apply agent-specific response, laboratory and adverse-event monitoring.

  • A marketing authorisation does not equal NHS eligibility: verify the current disease-specific NICE technology appraisal, severity threshold, previous-treatment requirement and local pathway before offering a drug.
  • Biologics are antibodies or receptor proteins targeting cytokines or cells; small molecules enter cells and inhibit signalling enzymes such as JAK, TYK2 or PDE4 and often need more laboratory and interaction surveillance.
  • Baseline review includes infection history, TB, hepatitis B and C, HIV by risk, vaccination, FBC, renal and liver function, pregnancy plans, malignancy, cardiovascular and thrombotic risk and disease-specific comorbidity.

Key red flags

Fever or systemic infection, shingles near the eye, persistent cough or weight loss, new neurological deficit, severe abdominal pain or bloody diarrhoea, chest pain, breathlessness, limb swelling, jaundice, marked cytopenia, anaphylaxis, pregnancy or new malignancy requires prompt treatment interruption and specialist assessment.

Serious infection

Hypotension, hypoxia, confusion, disseminated vesicles or rapidly spreading painful skin infection is an emergency even when inflammatory markers are blunted.

Investigation priorities

01
Disease severity and eligibility recordFirst step

Demonstrate that the current NICE and local initiation criteria are met.

Management branches

First-line targeted selectionMatch appraisal, mechanism and person

Severe skin disease remains uncontrolled and targeted treatment is being considered.

  1. Confirm the live NICE indication, required severity and previous-treatment sequence and document an objective baseline outcome and goals important to the patient.
  2. Screen infection, vaccination, pregnancy, malignancy, cardiovascular, thrombotic, neurological, bowel and eye risks and map them against candidate mechanisms.

Key medicines

Adalimumab exemplar for adult plaque psoriasisUnder a current NICE-eligible specialist pathway, give 80 mg subcutaneously initially, then 40 mg every other week starting 1 week after the initial dose; use the specific biosimilar device and current SmPC.
Dupilumab exemplar for adult atopic dermatitisGive a 600 mg subcutaneous loading dose as two 300 mg injections, followed by 300 mg every other week under the licensed and NICE-commissioned adult atopic-dermatitis pathway.
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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom