I've never had this. But I'm pretty sure that folic acid doesnt carry side effects. Let me see what I can find online.
Here is what I found.
Side Effects of Folic Acid - for the Consumer
Folic Acid
All medicines may cause side effects, but many people have no, or minor, side effects. When used in small doses, no COMMON side effects have been reported with Folic Acid. Seek medical attention right away if any of these SEVERE side effects occur when using Folic Acid:
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); pain, redness, or swelling at the injection site.
Folic Acid XTRA
All medicines may cause side effects, but many people have no, or minor, side effects. No COMMON side effects have been reported with Folic Acid XTRA . Seek medical attention right away if any of these SEVERE side effects occur when using Folic Acid XTRA:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); feeling of swelling of the entire body; numbness or tingling of the skin.
Folic Acid with Vitamin B6 and B12
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Folic Acid with Vitamin B6 and B12:
Diarrhea; drowsiness.
Seek medical attention right away if any of these SEVERE side effects occur when using Folic Acid with Vitamin B6 and B12:
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); difficulty grasping with your hands; difficulty walking; itching, tingling, or numbness of fingers or toes; loss of muscle coordination.
Folic Acid/Vitamin B6/Vitamin B12/Omega-3 Acids/Phytosterols
All medicines may cause side effects, but many people have no, or minor side effects. No COMMON side effects have been reported with Folic Acid/Vitamin B6/Vitamin B12/Omega-3 Acids/Phytosterols. Seek medical attention right away if any of these SEVERE side effects occur when using Folic Acid/Vitamin B6/Vitamin B12/Omega-3 Acids/Phytosterols:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); feeling of swelling of the entire body; numbness or tingling of the skin.
Folic Acid Capsules
All medicines may cause side effects, but many people have no, or minor, side effects. When used in small doses, no COMMON side effects have been reported with Folic Acid Capsules. Seek medical attention right away if any of these SEVERE side effects occur when using Folic Acid Capsules:
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).
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Folic Acid Side Effects - for the Professional
Folic Acid
Allergic sensitization has been reported following both oral and parenteral administration of Folic Acid.
Folic Acid is relatively nontoxic in man. Rare instances of allergic responses to Folic Acid preparations have been report ed and have included erythema, skin rash, itching, general malaise, and respiratory difficulty due to bronchospasm. One patient experienced symptoms suggesting anaphylaxis following injection of the drug. Gastrointestinal side effects, including anorexia, nausea, abdominal distention, flatulence, and a bitter or bad taste, have been reported in patients receiving 15 mg Folic Acid daily for 1 month. Other side effects reported in patients receiving 15 mg daily include altered sleep patterns, difficulty in concentrating, irritability, overactivity, excitement, mental depression, confusion, and impaired judgment. Decreased vitamin B12 serum levels may occur in patients receiving prolonged Folic Acid therapy. In an uncontrolled study, orally administered Folic Acid was reported to increase the incidence of seizures in some epileptic patients receiving phenobarbital, primidone, or diphenylhydantoin. Another investigator reported decreased diphenylhydantoin serum levels in folate-deficient patients receiving diphenylhydantoin who were treated with 5 mg or 15 mg of Folic Acid daily.
