Medically reviewed on September 10, 2018
(RYE boe flay vin)
- Vitamin B2
- Vitamin G
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
B-2-400: 400 mg
Generic: 50 mg
Generic: 25 mg, 50 mg, 100 mg
Brand Names: U.S.
- B-2-400 [OTC]
- Vitamin, Water Soluble
Component of flavoprotein enzymes that work together, which are necessary for normal tissue respiration; also needed for activation of pyridoxine and conversion of tryptophan to niacin
Readily via GI tract; increased with food
9% eliminated unchanged in urine
Biologic: 66 to 84 minutes
Use: Labeled Indications
Off Label Uses
Prevention of migraine headache
Data from randomized, placebo- and active-controlled trials supports the use of riboflavin as a preventative treatment to decrease the frequency, duration, and severity of migraine headaches [Rahimdel 2015], [Shoenen 1998]. Additional trials may be necessary to further define the role of riboflavin in this condition.
Based on the American Headache Society and American Academy of Neurology guidelines for migraine prevention, riboflavin is probably effective for migraine prevention [AHS/AAN [Holland 2012]]. Similarly, guidelines from the Canadian Headache Society give riboflavin a strong recommendation based on low-quality evidence for use as a preventative treatment for migraines [CHS [Pringsheim 2012]].
Dietary supplement: Oral: 100 mg once or twice daily
Prevention of migraine headache (off-label use): Oral: 400 mg once daily (Rahimdel 2015; Schoenen 1998)
Refer to adult dosing.
Dietary sources of riboflavin include liver, kidney, dairy products, green vegetables, eggs, whole grain cereals, yeast, and mushroom.
Dietary reference intake (IOM 1998):
1 to 6 months: Adequate intake: 0.3 mg/day
7 to 12 months: Adequate intake: 0.4 mg/day
1 to 3 years: RDA: 0.5 mg
4 to 8 years: RDA: 0.6 mg
9 to 13 years: RDA: 0.9 mg
14 to 18 years: RDA: Females: 1 mg; Males: 1.3 mg
≥19 years: RDA: Females: 1.1 mg; Males: 1.3 mg
Pregnancy: RDA: 1.4 mg
Lactation: RDA: 1.6 mg
Protect from light.
There are no known significant interactions.
Large doses may interfere with urinalysis based on spectrometry; may cause false elevations in fluorometric determinations of catecholamines and urobilinogen
Frequency not defined: Genitourinary: Urine discoloration (yellow-orange)
• Vitamin deficiency: Single vitamin deficiency is rare; evaluate for other deficiencies.
Water-soluble vitamins cross the placenta. Riboflavin requirements may be increased in pregnant women compared to nonpregnant women (IOM 1998).
• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)
• Patient may experience urine discoloration (HCAHPS).
• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.
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