Folic acid
Folic acid (folate) is a B vitamin used to prevent neural tube defects in developing babies — women planning pregnancy are advised folic acid supplementation before conception and until 12 weeks in line with UK guidance, and some need higher prescribed doses.
This medicine is part of the Blood pressure, cholesterol & related category.
Generic name: folic acid
Quick answers
Short replies to searches people often run before speaking to a clinician. For the overview of what the medicine is used for, see the short summary under the page title above.
What is it for?
Folic acid (folate) is a B vitamin used to prevent neural tube defects in developing babies — women planning pregnancy are advised folic acid supplementation before conception and until 12 weeks in li…
How long does it take to work?
acid (folate) is a B vitamin used to prevent neural tube defects in developing babies — women planning pregnancy are advised folic acid supplementation before conception and until 12 weeks in line with UK guidance, and some need higher prescribed doses.
What are common side effects?
Folic acid is usually well tolerated.
Can you take paracetamol or ibuprofen with it?
Ask your GP or pharmacist before taking Folic acid with paracetamol or ibuprofen. Many adults use paracetamol for short periods when appropriate; NSAIDs such as ibuprofen need extra checks with your other medicines and health conditions.
More about what Folic acid is used for
Folic acid (folate) is a B vitamin used to prevent neural tube defects in developing babies — women planning pregnancy are advised folic acid supplementation before conception and until 12 weeks in line with UK guidance, and some need higher prescribed doses.
It also treats folate-deficiency anaemia when diagnosed, and is sometimes prescribed alongside Methotrexate or other medicines to reduce side effects — always as directed by your prescriber.
How does Folic acid work, and how long does it take to work?
Folate is needed for DNA production and red blood cell formation. Supplements correct deficiency and support rapid cell division in early pregnancy.
It does not replace a balanced diet but adds a reliable dose.
How and when should you take Folic acid?
For general pre-conception advice, typical supplements are 400 micrograms daily unless your GP recommends a higher strength (for example if you have diabetes, certain medicines, or a previous neural tube defect).
Swallow tablets with water. If you take Methotrexate, folic acid timing is usually on non-methotrexate days — follow your rheumatology or dermatology plan exactly.
What are the common side effects of Folic acid?
Folic acid is usually well tolerated. Mild nausea or bloating can occur.
Serious side effects of Folic acid — when to get urgent help
High-dose folic acid can mask untreated vitamin B12 deficiency and allow nerve damage to progress — your GP may check B12 if you have anaemia or risk factors.
Allergic reactions are rare but possible.
What if you miss a dose of Folic acid?
Take when remembered unless nearly time for next dose. Do not double up.
Who should not take Folic acid?
Untreated vitamin B12 deficiency should be addressed before high-dose folic acid. Some cancers need individual advice before supplements.
Can you take paracetamol or ibuprofen with Folic acid? — other interactions
Phenytoin and some epilepsy medicines may interact with folate — your neurologist monitors levels. Methotrexate regimens include specific folic acid schedules.
Folic acid in pregnancy and breastfeeding
Folic acid is recommended before and early in pregnancy as per national guidance; breastfeeding use is generally compatible at usual supplement doses.
Blood tests and monitoring on Folic acid
Blood tests for anaemia, B12, and folate may guide treatment duration for deficiency.
What might your GP prescribe instead of Folic acid?
Dietary folate from leafy greens and fortified foods helps, but supplements are still advised for pregnancy planning in UK guidance.
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Reviewed by UK registered pharmacists for accuracy and clarity. Content is informational only.
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Frequently asked questions about Folic acid
People also ask — common Google searches
- What is Folic acid used for?
- Folic acid (folate) is a B vitamin used to prevent neural tube defects in developing babies — women planning pregnancy are advised folic acid supplementation before conception and until 12 weeks in line with UK guidance, and some need higher prescribed doses.
- How long does Folic acid take to work?
- acid (folate) is a B vitamin used to prevent neural tube defects in developing babies — women planning pregnancy are advised folic acid supplementation before conception and until 12 weeks in line with UK guidance, and some need higher prescribed doses. Always follow your prescriber’s follow-up plan.
- Can you take Folic acid with paracetamol or ibuprofen?
- Ask your GP or pharmacist before taking Folic acid with Paracetamol or Ibuprofen. Many adults use paracetamol for short periods when appropriate; NSAIDs such as ibuprofen need extra checks with your other medicines and health conditions.
- What are the side effects of Folic acid?
- Folic acid is usually well tolerated. Mild nausea or bloating can occur. See the sections below for more detail, including serious side effects and when to seek urgent help.
- Is folic acid the same as folate?
- Folic acid is the synthetic form used in tablets; the body converts it to active folate. Both terms appear on labels — follow NHS pre-pregnancy advice or your prescription.
- Do men need folic acid?
- General supplementation is not usually required unless a doctor diagnoses deficiency. Pre-conception advice mainly targets people who could become pregnant.
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Often used with
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