Rheumatrex
Rheumatrex is a brand of methotrexate, an antimetabolite and immunosuppressant. It is used to manage severe rheumatoid arthritis, control psoriasis, and treat certain cancers by slowing down the production of rapidly replicating cells and suppressing the immune system.
Dosage by Body Weight
CRITICAL WARNING: Rheumatrex is typically taken ONCE A WEEK, not daily, for rheumatoid arthritis and psoriasis. Daily administration can result in severe or fatal toxicity. Dosage must be strictly individualized and monitored by a physician.
- Body Weight
- Below 5 kg
- Dose
- Not recommended
- Frequency
- N/A
- Tracking Notes
- Safety and efficacy are not established for routine use in this weight range. Only use if specifically directed by a pediatric specialist.
- Body Weight
- 5-7 kg
- Dose
- BSA-based dosing
- Frequency
- Once weekly
- Tracking Notes
- Pediatric dosing for juvenile idiopathic arthritis is calculated based on Body Surface Area (typically 10 to 15 mg/m² per week).
- Body Weight
- 8-10 kg
- Dose
- BSA-based dosing
- Frequency
- Once weekly
- Tracking Notes
- Requires strict calculation by a pediatric specialist using Body Surface Area. Do not administer without a precise prescription.
- Body Weight
- 11-15 kg
- Dose
- BSA-based dosing
- Frequency
- Once weekly
- Tracking Notes
- Requires strict calculation by a pediatric specialist using Body Surface Area. Do not administer without a precise prescription.
- Body Weight
- 16-20 kg
- Dose
- BSA-based dosing
- Frequency
- Once weekly
- Tracking Notes
- Requires strict calculation by a pediatric specialist using Body Surface Area. Do not administer without a precise prescription.
| Body Weight | Dose | Frequency | Tracking Notes |
|---|---|---|---|
| Below 5 kg | Not recommended | N/A | Safety and efficacy are not established for routine use in this weight range. Only use if specifically directed by a pediatric specialist. |
| 5-7 kg | BSA-based dosing | Once weekly | Pediatric dosing for juvenile idiopathic arthritis is calculated based on Body Surface Area (typically 10 to 15 mg/m² per week). |
| 8-10 kg | BSA-based dosing | Once weekly | Requires strict calculation by a pediatric specialist using Body Surface Area. Do not administer without a precise prescription. |
| 11-15 kg | BSA-based dosing | Once weekly | Requires strict calculation by a pediatric specialist using Body Surface Area. Do not administer without a precise prescription. |
| 16-20 kg | BSA-based dosing | Once weekly | Requires strict calculation by a pediatric specialist using Body Surface Area. Do not administer without a precise prescription. |
Formulation
Purpose
Treatment of severe active rheumatoid arthritis, severe psoriasis, and polyarticular juvenile idiopathic arthritis.
Generic Name
MethotrexateScheduled Drug
No. This medicine is generally not treated as a scheduled/prescription-only drug in common consumer references, but local rules may vary.