Immunosuppressants
Dental Considerations for Patients Taking Methotrexate
Proceed with precautions (methotrexate)
Patient on methotrexate. Invasive care can usually proceed with infection vigilance, relevant blood tests, and physician coordination if significantly immunosuppressed.
Emergency vs routine management
If EMERGENCY — what to do
- • Treat infection promptly; check FBC before surgery (myelosuppression).Ref: Little JW, Miller CS et al. Dental Management of the Medically Compromised Patient, 10th ed., Elsevier 2023
- • Avoid NSAIDs, trimethoprim/co-trimoxazole and high-dose penicillins — they reduce methotrexate excretion (toxicity).Ref: Stockley's Drug Interactions (current edition)
If ROUTINE — what to do
- • Low-dose weekly methotrexate: routine care, no interruption.Ref: Goodman SM et al. 2022 ACR/AAHKS Guideline for Perioperative Management of Antirheumatic Medication. Arthritis Care Res 2022;74:1399–1408
- • Watch for oral ulceration — an early sign of toxicity.Ref: British National Formulary (BNF) — Prescribing in renal impairment, hepatic impairment & drug interactions (current edition)
Clinical precautions
- • Meticulous infection control; treat oral infection promptly
- • Antibiotic prophylaxis is NOT routinely required for immunosuppression alone — decide case-by-case with the treating physician for invasive/surgical procedures. If indicated: Amoxicillin 2 g orally 1 hour before (adult); if penicillin-allergic, Clindamycin 600 mg or Azithromycin/Clarithromycin 500 mg orally 1 hour before.
- • Avoid NSAIDs — they can raise methotrexate levels and toxicity; use paracetamol for analgesia.
- • Weekly dosing: confirm it is not being taken daily by mistake.
- • Coordinate with the treating physician for significant immunosuppression
Information & tests to request
- • Absolute neutrophil count — ANC (x10⁹/L) — methotrexate can suppress the bone marrow/immune system. A full blood count checks for neutropenia; we wait for ANC ≥1.0 (ideally ≥2.0) before invasive care.
At a glance by procedure
Initial assessment before lab results or timing details are entered.
| Procedure | Initial assessment |
|---|---|
| Examination / radiographs | ROUTINE Routine non-invasive care (methotrexate) |
| Supragingival scaling / polish | MODIFY / CAUTION Proceed with precautions (methotrexate) |
| Deep scaling / subgingival RSD (subgingival calculus) | MODIFY / CAUTION Proceed with precautions (methotrexate) |
| Root canal treatment | MODIFY / CAUTION Proceed with precautions (methotrexate) |
| Simple extraction (1–3 teeth) | MODIFY / CAUTION Proceed with precautions (methotrexate) |
| Surgical / bony extraction | MODIFY / CAUTION Proceed with precautions (methotrexate) |
| Implant placement | MODIFY / CAUTION Proceed with precautions (methotrexate) |
References
- Immunosuppressant drugs — dental considerations
- Little JW, Miller CS et al. Dental Management of the Medically Compromised Patient, 10th ed., Elsevier 2023
- Stockley's Drug Interactions (current edition)
- Goodman SM et al. 2022 ACR/AAHKS Guideline for Perioperative Management of Antirheumatic Medication. Arthritis Care Res 2022;74:1399–1408
- British National Formulary (BNF) — Prescribing in renal impairment, hepatic impairment & drug interactions (current edition)
Related guides
This guide supports — and does not replace — professional clinical judgment. Always consider the individual patient and consult the treating physician when indicated.