What is Folic Acid: Uses, Warnings & Interactions

Updated Oct 9, 2025  •  Published Dec 30, 2020

Folic Acid overview

BRAND NAMES:

  • FA-8, Folacin-800, Methylfolate, Nature's Blend Folic Acid, Optimum Folic Acid, PharmAssure Folic Acid, Sunmark Folic Acid

Generic Names:

  • Folic Acid

Uses:

  • Treats certain types of anemia (not enough red blood cells). Is also given as a supplement to women who are pregnant or planning on getting pregnant. Folic acid is a B vitamin.

Therapeutic Classes:

  • Nutriceutical, Nutritive Agent

Forms:

  • Capsule, Tablet

How it’s taken:

  • By mouth

What is Folic Acid used for?

What form(s) does Folic Acid come in

  • Capsule

  • Tablet

What are common Folic Acid doses?

  • Tablet 1MG

  • Tablet 800MCG

  • Bottle 100 Capsules

  • Bottle 100 Tablets

  • Bottle 180 Tablets

  • Bottle 250 Tablets

  • Bottle 10GM of

  • Bottle 100GM of

  • Vial 10ML of 5MG/ML

Common Folic Acid prescriptions

  • Folic Acid
    100 capsules bottle

  • Folic Acid
    100 tablets bottle

  • Folic Acid
    1000 tablets bottle

  • Folic Acid
    60 tablets bottle

  • Folic Acid
    1mg tablet

  • Folic Acid
    10ml of 5mg/ml vial

How to take Folic Acid

  • Your doctor will tell you how much to take and how often.

  • Keep taking this medicine for as long as your doctor tells you to, even if you feel better.

  • Your doctor will tell you how much to take and how often.

  • Keep taking this medicine for as long as your doctor tells you to, even if you feel better.

  • You should not use two doses at the same time.

What to do if you miss a dose of Folic Acid

  • Take the missed dose as soon as possible.

  • If it is almost time for your next regular dose, wait until then to take your medicine and skip the missed dose.

  • You should not use two doses at the same time.

Folic Acid contraindications

  • You should not use this medicine if you have ever had an allergic reaction to folic acid.

Folic Acid warnings

  • If you are pregnant or breastfeeding, tell your doctor. It is very important during this time to take the correct vitamins in the right amounts.

Folic Acid interactions

  • Your doctor may ask you to eat more foods that contain folic acid. Good sources of folic acid are fruits, green leafy vegetables, liver, kidney, and breads made with dried yeast.

  • If you are taking Questran® or Colestid®, take your folic acid dose 1 hour before or at least 4 hours after the other medicine.

  • Make sure your doctor knows if you are taking Dilantin®.

Folic Acid side effects

Serious Side Effects

  • Skin rash, itching, and redness

  • Bitter taste in the mouth

  • Irritability

  • Trouble sleeping

Less Serious Side Effects

  • Irritability

  • Bitter taste in the mouth

  • Trouble sleeping

  • Nausea, bloating, gas