How to Stop Methotrexate
Methotrexate should generally not be stopped abruptly; instead, gradual dose reduction is preferred over complete discontinuation, and if discontinuation is necessary, it should be done gradually rather than abruptly. 1
Context-Specific Discontinuation Approaches
For Pregnancy Planning (Most Critical Scenario)
Stop methotrexate at least 3 months before attempting conception for both men and women 2, 3. This is a strong recommendation despite very low-quality evidence, based on the potential for catastrophic teratogenic harm including:
- 3.4-fold increased risk of cardiovascular defects
- 2.6-fold increased risk of oral clefts
- 23% miscarriage rate with first-trimester exposure 2
If pregnancy occurs while on methotrexate:
- Stop immediately
- Start or continue folic acid supplementation
- Refer urgently for obstetric counseling
- Termination is not mandatory 2
The 3-month washout is based on pharmacokinetic data showing methotrexate polyglutamate elimination from red blood cells takes up to 10 weeks 2.
For Disease in Remission (Rheumatoid Arthritis)
Patients must be at target (low disease activity or remission) for at least 6 months before considering any tapering 4.
The recommended hierarchy for de-escalation is:
Continue all DMARDs at current dose (first choice - conditionally recommended) 4
If tapering desired: Dose reduction over gradual discontinuation 4
Monitoring during tapering:
- Disease flare risk increases significantly with complete discontinuation (RR 2.13) compared to dose reduction 5
- However, 87.5% of flares are reversible with re-treatment within median 12.4 weeks 5
- Short-term discontinuation up to 2 weeks is safe; 4-week discontinuation increases flare risk (20.5% vs 7.4%) 6
For Toxicity Management
Stop methotrexate immediately if:
- Confirmed ALT/AST >3× upper limit of normal 1
- New pulmonary symptoms (dry cough, dyspnea) suggesting pneumonitis 7
- Severe myelosuppression (WBC <1500, neutrophils <200, platelets <75,000) 7
- Serum creatinine increased by 50% or more 7
After stopping for elevated liver enzymes:
- Withhold for 1-2 weeks
- Recheck labs (values typically normalize in 1-2 weeks) 3
- May reinstitute at lower dose following normalization 1
- If abnormalities persist 2-3 months, consider liver biopsy before restarting 3
For Psoriasis
Tapering approach:
- Once optimal response achieved, reduce to lowest effective dose with longest possible rest period 7
- Goal is to return to conventional topical therapy 7
- Maximum dose should not ordinarily exceed 30 mg/week 7
- No specific tapering schedule provided in guidelines; adjust based on clinical response
Common Pitfalls to Avoid
Do not:
- Stop abruptly without medical indication (increases flare risk) 1, 4
- Taper if disease has been controlled <6 months 4
- Continue methotrexate if patient refuses liver biopsy when indicated 3
- Administer during active infection or with creatinine clearance <60 mL/min 7
Critical monitoring during any discontinuation:
- ALT/AST, creatinine, CBC should continue during tapering 1
- Clinical assessment for disease flare at each visit 1
- For rheumatoid arthritis: DAS28 monitoring; expect potential transient increase during 4-week discontinuation 6
Drug survival data: In patients on TNF inhibitors, tapering or discontinuing concomitant methotrexate does not significantly affect long-term biologic drug survival, suggesting appropriate patient selection in clinical practice 8.