Folic Acid With Methotrexate: Why Is It Prescribed and How to Take It? 6 Key Facts
Why Does Your Doctor Prescribe Folic Acid With Methotrexate?
Many patients are surprised to see a simple vitamin next to methotrexate on their prescription. This is no accident: taking folic acid with methotrexate is standard practice recommended by medical guidelines. Here we explain why and how to take it in 6 key facts.
1. Methotrexate Works Against Folate
Methotrexate blocks an enzyme the body needs to use folate. That is part of how it works, but it also explains many of its side effects, because healthy fast-dividing cells such as those in the mouth, gut and blood need folate too.
2. The Benefits of Folic Acid With Methotrexate
Scientific reviews show that adding folic acid:
- Reduces nausea and stomach upset.
- Reduces mouth ulcers.
- Reduces rises in liver enzymes.
- Lowers the chance of stopping treatment because of side effects.
3. Does Folic Acid Reduce the Effect of Methotrexate?
At the low doses used for rheumatoid arthritis and psoriasis, evidence does not show that folic acid meaningfully weakens methotrexate. High-dose cancer treatment is different, and the oncologist decides what is needed there.
4. Common Doses of Folic Acid With Methotrexate
Doctors prescribe it in different ways; the most common are:
- 5 mg once a week, often the day after the methotrexate dose.
- Or 1 mg daily, sometimes skipping the methotrexate day.
Follow your own doctor’s instructions and do not change the dose yourself.
5. Why It Is Often Not Taken on the Same Day
Many doctors prefer to separate folic acid from the methotrexate day so the two do not compete at the same time. So they set a specific day for each, for example methotrexate on Saturday and folic acid on Sunday. For more on the dose day, read methotrexate dosage.
6. Folic Acid Is Not Folinic Acid
Folinic acid, also called leucovorin, is an active form that doctors use for methotrexate toxicity or high-dose regimens. It is not a substitute for ordinary folic acid unless your doctor prescribes it.
Practical Tips
- Keep the methotrexate and folic acid packs separate so you never mix them up.
- Do not rely on a multivitamin instead; its folate content is different.
- Continue folic acid for as long as you take methotrexate.
- Tell your doctor if mouth ulcers or nausea continue despite folic acid, as the dose may need adjusting.
For other side effects, read methotrexate side effects, and for monitoring, read methotrexate blood tests.
When Will You Notice the Benefit?
Many patients notice that the nausea and tiredness on the day after their dose ease within a few weeks of taking folic acid with methotrexate regularly, and mouth ulcers become less frequent. If you see no difference, do not raise the dose yourself; tell your doctor, who may switch you from a weekly to a daily schedule or the other way round.
Remember that folic acid with methotrexate does not replace regular blood tests. It lowers the chance of problems but does not prevent them completely, so keep every scheduled check.
Frequently Asked Questions About Folic Acid With Methotrexate
Can I take folic acid every day?
Yes, if your doctor prescribed it that way; some doctors ask you to skip the methotrexate day.
Is folic acid safe in pregnancy?
Folic acid is safe and important in pregnancy, but methotrexate itself is strictly forbidden during pregnancy.
What if I forget my folic acid?
Usually take it when you remember, and never take a double dose.
Does folic acid help with hair thinning on methotrexate?
It may help a little, since hair thinning is partly related to folate; tell your doctor if it bothers you.
Can I buy folic acid over the counter?
Yes, but use the exact strength your doctor wrote, as tablets come in 0.4 mg, 1 mg and 5 mg.
Conclusion
Taking folic acid with methotrexate is a key step that reduces nausea, mouth ulcers and liver problems without reducing the drug’s effect in rheumatoid arthritis and psoriasis. Stick to the dose and day your doctor set, and find Methotrexate Pfizer 2.5 mg at No Style Like Pharmacy.
This article was reviewed by the No Style Like pharmacy content team. It is for general awareness only. Methotrexate is a prescription medicine to be used only under medical supervision, and this article does not replace your doctor’s advice.
Do not stop folic acid or change its dose without asking your doctor. For more information see the MedlinePlus methotrexate page.