If you miss a methotrexate dose, do not take two doses together to catch up. What to do depends on why you take it, your prescribed schedule, and how late the dose is. For methotrexate taken once a week for inflammatory conditions, contact your prescriber or pharmacist if you remember more than two days late. Cancer treatment and other specialist schedules need different, individualized instructions.
What happens if you miss one dose of methotrexate?
Missing a single dose does not necessarily cause an immediate change in how you feel. Methotrexate is commonly prescribed for long-term control of inflammatory conditions, including rheumatoid arthritis and psoriasis. If a dose is missed, the effect on symptom control depends on the condition being treated, the prescribed schedule, and how long treatment is interrupted.
You may notice no immediate difference after missing one weekly dose. However, repeated missed doses can make it harder to maintain consistent treatment. Symptoms associated with the condition being treated may become less well controlled over time. A missed dose does not automatically mean your treatment has failed, and you should not change your dose or stop treatment without discussing it with your healthcare professional.
The American College of Rheumatology explains that methotrexate is generally taken once a week for inflammatory conditions and helps reduce joint pain and swelling while limiting long-term joint damage. Because its intended effects develop over time, one missed dose does not necessarily lead to an immediate return of symptoms.
What should you do if you miss your weekly dose?
For people taking methotrexate once a week for inflammatory conditions, the next step depends on when you remember the missed dose. The NHS guidance on methotrexate advises taking the missed dose if you remember the next day or the day after. If more than two days have passed, contact your doctor or clinic for instructions.
There is also specific guidance from the NHS Specialist Pharmacy Service stating that a once-weekly dose remembered three or more days late should be skipped, with the next dose taken on the usual day. Since your treatment plan and prescription instructions matter, check with your prescriber or pharmacist if you are uncertain about when to resume treatment.
Never take two doses together to make up for a missed dose. Taking extra methotrexate can cause serious toxicity. Do not increase the next dose, take it more frequently, or change your regular dosing day without appropriate instructions.
What if you miss more than one dose?
If you have missed two or more scheduled doses, contact your prescribing clinician or pharmacist before taking another dose. Explain when you last took methotrexate, how many doses you missed, and the dose and schedule on your prescription. This information helps your healthcare professional decide how treatment should continue.
Do not restart treatment with a larger dose or take extra tablets over several days to compensate. Depending on the reason you take methotrexate and your treatment plan, your clinician may recommend returning to your usual schedule or give you different instructions. If symptoms related to your condition have returned or are becoming more disruptive, mention this when seeking advice.
Does the advice change if you take methotrexate for cancer?
Yes. Methotrexate is used for cancer treatment as well as inflammatory conditions, and cancer treatment schedules can differ from the usual once-weekly schedule. Instructions intended for someone taking weekly methotrexate for arthritis or psoriasis should not automatically be applied to cancer treatment.
If you receive methotrexate as part of cancer care and miss a dose or appointment, contact your oncology team promptly for instructions. Macmillan Cancer Support advises contacting the cancer team when a dose is missed and not taking a double dose to make up for it. Follow the treatment schedule and instructions provided by your specialist team.
What if you accidentally take methotrexate every day instead of every week?
Taking methotrexate more frequently than prescribed is a different situation from missing a dose. For certain conditions, methotrexate is intended to be taken once a week. Accidentally taking it daily instead can cause severe, potentially life-threatening harm.
If you have taken more methotrexate than prescribed, or have accidentally taken your weekly dose on multiple days, seek urgent medical advice immediately. Contact your local emergency service or poison-information service if available, and do not wait for symptoms to develop. The U.S. National Library of Medicine's MedlinePlus drug information warns that taking methotrexate daily instead of weekly has resulted in very serious side effects and deaths.
Does missing a dose mean your symptoms will come back?
Not necessarily. Some people may not notice any change after a single missed weekly dose. Others may notice changes in symptoms, depending on the condition being treated and their treatment history. There is no fixed timeline for symptoms to return after a missed dose.
If you take methotrexate for an inflammatory condition, pay attention to changes that affect your usual daily activities. For example, you may notice more joint pain, stiffness, swelling, or skin symptoms, depending on the condition for which the medicine was prescribed. These changes do not automatically establish that a missed dose is responsible, but persistent or worsening symptoms should be discussed with your healthcare professional.
How can you avoid missing methotrexate doses?
Because methotrexate is often prescribed on a weekly schedule, it is important to make the dosing day clear and easy to remember. These practical steps can help reduce missed doses and dosing mistakes:
- Choose a consistent day: Take your weekly dose on the day specified by your prescriber.
- Set a reminder: Use a phone alarm, calendar alert, or medication reminder app.
- Record each dose: Mark the dose as taken after you have actually taken it.
- Keep weekly medicine separate: Store methotrexate separately from daily medicines to help prevent confusion.
- Check your instructions: Keep the prescription label and patient information leaflet accessible, and ask your pharmacist to clarify anything you do not understand.
These measures are especially useful if you take several medicines or help a family member manage their treatment. For children and young people prescribed methotrexate, parents and caregivers should follow the instructions from the prescribing specialist rather than assuming adult dosing advice applies.
When should you contact a healthcare professional?
Contact your prescriber or pharmacist if you are unsure what to do after missing a dose, remember it more than two days late, miss multiple doses, or cannot confirm when you last took the medicine. If methotrexate is part of a cancer treatment plan or another specialist regimen, contact the treating team for instructions specific to that schedule.
Seek urgent medical help if you have taken an extra dose or taken methotrexate more frequently than prescribed. The risks of taking too much are different from the risks of missing a dose, and the response should be prompt even if you initially feel well.
The key point is to avoid trying to make up a missed dose yourself. Check the instructions for your prescribed schedule, contact your healthcare professional when needed, and return to a confirmed dosing plan.