Introduction (Side effects of methotrexate)

Methotrexate is one of the most widely used medications for rheumatoid arthritis (RA) and other autoimmune conditions. It is often called the “gold standard” treatment because of its effectiveness in controlling inflammation and preventing joint damage. However, like many medications, methotrexate can cause side effects.

As a rheumatologist, I often encounter patients who experience significant stress due to hair loss while taking methotrexate (MTX). Although MTX is an essential medication for the management of rheumatoid arthritis, when side effects such as hair loss become severe, it may be necessary to consider switching to an alternative therapy after discussing it thoroughly with the patient. Sometimes, the discomfort or distress caused by the medication can outweigh its therapeutic benefits.

Today, I would like to briefly review the common side effects of methotrexate.

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1. Gastrointestinal Problems

One of the most common side effects of methotrexate is nausea, vomiting, or abdominal discomfort. Some patients also report loss of appetite.

👉 Tip: Taking methotrexate after a meal, or switching from oral to injectable form, can often reduce stomach issues.

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2. Fatigue and Malaise

Many patients experience unusual tiredness the day after taking methotrexate. While usually mild, this fatigue can interfere with daily activities.

👉 Tip: Plan to take methotrexate before a day when you can rest if possible.

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3. Methotrexate hair loss

Methotrexate may lead to mild hair loss (alopecia) in some people. This happens because it affects rapidly dividing cells, including those in hair follicles.

👉 Tip: Supplementing with folic acid (commonly prescribed alongside methotrexate) often helps reduce this effect.

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4. Liver Function Abnormalities

Since methotrexate is metabolized in the liver, it can cause elevated liver enzymes. Long-term use may increase the risk of liver fibrosis if not properly monitored.

👉 Tip: Regular blood tests (every 1–3 months) are essential to detect early signs of liver issues. Avoid alcohol to reduce the risk.

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5. Bone Marrow Suppression (Rare but Serious)

Methotrexate may affect blood cell production, leading to anemia, low white blood cell count, or low platelets. This is rare but can be dangerous.

👉 Tip: Always report unusual bruising, bleeding, or frequent infections to your doctor.

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How to Reduce the Risk of Side Effects

• Take folic acid supplements as prescribed.
• Have regular blood tests to check liver and blood counts.
• Limit alcohol consumption.
• Report any unusual symptoms to your healthcare provider promptly.

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Conclusion

Methotrexate remains one of the most effective medications for controlling arthritis, but understanding its potential side effects is key to safe treatment. Most side effects are mild and manageable with proper monitoring and lifestyle adjustments. Always work closely with your rheumatologist to find the right dose and schedule for your individual needs. For more information, you can explore the medlineplus.