Methotrexate for juvenile rheumatoid arthritis
Examples
Generic Name Brand Name methotrexate sodium Folex PFS, MTX, Rheumatrex How It Works
Methotrexate reduces inflammation caused by juvenile rheumatoid arthritis (JRA).
Why It Is Used
Most experts believe the potential benefits of methotrexate in children with JRA are greater than the risks of serious side effects, and methotrexate has become the preferred second-line medicine for children with JRA. It is generally reserved for children who do not respond to nonsteroidal anti-inflammatory drugs (NSAIDs). However, some children with JRA, especially those with polyarticular JRA, gain significant benefit from early methotrexate treatment. Methotrexate decreases symptoms and may slow joint damage.1
Methotrexate may also be used for resistant chronic inflammatory eye disease (uveitis) in children with JRA.2
Methotrexate should not be used in children with chronic liver disease. Some children with kidney disease can take methotrexate, but they require an adjusted dose and careful monitoring.
How Well It Works
Methotrexate appears to be effective for juvenile rheumatoid arthritis.1 Methotrexate may improve the:
- Number of joints that are pain-free with motion.
- Severity of pain.
- Number of joints with limited motion.
- Results of the erythrocyte sedimentation rate test (ESR, or sed rate).
Side Effects
Serious but rare side effects of methotrexate include:
- Reduced white blood cell, red blood cell, or platelet counts.
- Inflammation of the lungs (allergic pneumonitis).
- Liver inflammation (abnormal liver enzyme blood tests or hepatitis) or mild to moderate scarring (fibrosis). Liver inflammation or fibrosis seems to be less common and less severe in children than in adults.
- Severe liver damage (severe scarring or cirrhosis). Cirrhosis is not reversible, but it is rare and is most often seen in patients with underlying liver disease, diabetes, or alcohol abuse.
Minor side effects include:
- Stomach and intestinal symptoms (nausea, vomiting, diarrhea, or stomach upset). If your child becomes severely dehydrated from vomiting or diarrhea, methotrexate should be stopped until the symptoms resolve.
- Mouth sores.
- Hair thinning.
None of these side effects are permanent. Folic acid supplements may decrease the severity of side effects.
Effects on blood cells and liver inflammation can be detected early by regular blood tests (every 1 to 2 months) and almost always return to normal when methotrexate is discontinued. Regular blood tests may help detect liver inflammation. In very rare cases, inflammation can lead to more serious liver scarring (fibrosis or cirrhosis).
Anyone taking methotrexate must avoid alcohol use to prevent significant drug interactions.
Women taking methotrexate should avoid becoming pregnant, as the drug causes miscarriage and possibly birth defects.
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
What To Think About
Children who are taking methotrexate should not take other medicines without the approval of the health professional who is treating their JRA. Methotrexate interacts dangerously with certain other medicines.
Frequent blood monitoring for blood cell counts and liver function enzymes should be done during methotrexate therapy.
Methotrexate may increase the risk of developing certain infections, such as shingles and pneumonia.
Methotrexate has been shown to be safe for long-term use in most children, but it is still usually tapered off and discontinued about 1 year after remission.1
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| Author: | Shannon Erstad, MBA/MPH | Last Updated: June 30, 2006 |
| Medical Review: | Michael J. Sexton, MD - Pediatrics Ross E. Petty, MD, PhD, FRCPC - Pediatric Rheumatology | |
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| Topic Contents | |
| Examples | |
| How It Works | |
| Why It Is Used | |
| How Well It Works | |
| Side Effects | |
| What To Think About | |
| References | |