Should I Keep Taking Folic Acid After Stopping Methotrexate?

When It Makes Sense

• Good fit: You were prescribed folic acid for a reason that persists after methotrexate. If your clinician started folic acid because of a documented folate deficiency, poor dietary intake, malabsorption, heavy alcohol use, pregnancy, or another medication that lowers folate (such as sulfasalazine, trimethoprim, or certain anti-seizure drugs), continuing it may still make sense. In these situations, folic acid is treating a separate need, not just offsetting methotrexate side effects.
• Good fit: You are pregnant, trying to conceive, or could become pregnant. Preconception and early-pregnancy folic acid supplementation is widely recommended to reduce the risk of neural tube defects. If you stopped methotrexate because of pregnancy planning, your obstetric or rheumatology clinician will usually advise continuing folic acid under medical supervision.

When You Should Avoid It

• Warning sign: You have no remaining medical indication for folic acid. For many people on low-dose methotrexate for conditions like rheumatoid arthritis or psoriasis, folic acid is prescribed mainly to lessen mouth sores, nausea, and liver enzyme abnormalities caused by methotrexate. Once methotrexate is stopped, that protective role is no longer needed, and continuing the supplement without a clear reason may be unnecessary.
• Warning sign: You are self-prescribing or taking high doses without guidance. Long-term high-dose folic acid can mask a vitamin B12 deficiency, which may delay diagnosis and allow nerve damage to progress. It can also interact with certain medications. Do not continue or increase folic acid on your own; confirm the dose and duration with your clinician.

Pros and Cons

Pros

• Continued protection against folate deficiency. If your diet lacks leafy greens, legumes, fortified grains, or citrus, or if another condition or medication depletes folate, continuing folic acid can help maintain normal red blood cell formation and reduce deficiency symptoms such as fatigue or anemia.
• Support during pregnancy planning. Folic acid taken before conception and in early pregnancy supports fetal neural tube development. If methotrexate was stopped because of family planning, continuing folic acid under clinician guidance is generally appropriate.

Cons

• Possible unnecessary supplementation. If folic acid was only a companion to methotrexate, continuing it adds a daily pill, cost, and potential side effects (such as mild digestive upset or sleep disturbances) without a clear health benefit.
• Risk of masking B12 deficiency. Higher doses of folic acid can correct anemia caused by low B12 while allowing neurological damage from B12 deficiency to worsen unnoticed. This is especially relevant for older adults, vegans, people with pernicious anemia, or those on long-term acid-reducing medications.

Decision Checklist

• Why was I prescribed folic acid in the first place? If the only reason was to reduce methotrexate side effects, ask your prescriber whether stopping folic acid at the same time is appropriate.
• Do I have any other condition or medication that affects folate levels? Review your full medication list, dietary habits, alcohol intake, and any history of anemia or malabsorption with your clinician.
• Am I pregnant, planning pregnancy, or breastfeeding? Reproductive plans strongly influence folic acid recommendations, and you should coordinate decisions between your rheumatologist, primary care clinician, and obstetric provider.

Alternatives to Consider

If you no longer need folic acid to offset methotrexate, the simplest alternative is usually to stop the supplement under your clinician’s guidance. You can also emphasize dietary folate from foods such as spinach, lentils, asparagus, broccoli, beans, fortified breakfast cereals, and orange juice. If there is concern about deficiency, your clinician may order blood tests for folate and vitamin B12 before and after you stop. In some cases, a lower dose or an intermittent folic acid schedule may be suggested instead of stopping completely. Always coordinate the change with the prescriber rather than adjusting medications on your own.

Final Recommendation

For most people, folic acid taken alongside methotrexate can be discontinued once methotrexate is stopped, unless there is a separate reason to continue it. The best next step is to speak with the clinician who prescribed your methotrexate or folic acid. They can review why you were taking it, check for deficiency or interactions, and recommend whether to stop, taper, or switch to a food-first approach. Because this involves prescription medications and nutritional status, do not make changes without professional guidance tailored to your health history.