Can methotrexate cause itching?
Yes. Itching can occur with methotrexate, most often because methotrexate can cause skin reactions. These can range from mild irritation to allergic-type rashes. Itching is a known symptom of drug-related hypersensitivity and other skin effects associated with medications like methotrexate [1].
What does methotrexate itching look like?
People may notice:
- Itching with a rash or hives (which can suggest an allergic reaction)
- Itching with redness or other skin changes
- General skin irritation without a clearly obvious rash, especially early on [1]
When is itching a sign of an emergency?
Get urgent medical help if itching comes with signs of a serious allergic reaction, such as:
- Trouble breathing or wheezing
- Swelling of the face, lips, tongue, or throat
- Widespread rash or hives that spread quickly
- Dizziness or fainting [1]
What should you do if you develop itching after starting methotrexate?
Contact the prescriber promptly to discuss whether the symptoms fit a mild side effect or a possible allergy. Do not stop or adjust methotrexate on your own, especially if it’s controlling a chronic condition (like rheumatoid arthritis or psoriasis), unless a clinician tells you to. If the itching is accompanied by rash/hives or other allergic symptoms, clinicians may advise stopping and evaluating right away [1].
Does the timing matter?
Skin symptoms can show up soon after starting methotrexate or after dose changes, but they can also occur later. If the itching started after methotrexate began (or dose was increased) and improves when it’s held or stopped under medical guidance, that strengthens the connection [1].
Could itching be from something else while you’re on methotrexate?
Yes. Itching has many causes (dry skin, eczema, infections, liver or blood-related issues, or other medications). But if the timing lines up with methotrexate and there are skin findings (like rash or hives), methotrexate becomes a more likely contributor [1].
Sources
- DailyMed. Methotrexate (prescribing information / drug label). https://dailymed.nlm.nih.gov/