Medically reviewed by Drugs.com. Last updated on Sep 3, 2020.
(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 supplement: Infants, Children, and Adolescents: A multivitamin preparation is most commonly used for the provision of riboflavin supplementation in pediatric patients; the use of a single-ingredient riboflavin product as a daily supplement for the prevention of deficiency in pediatric patients is very rare. If single-ingredient riboflavin supplement is necessary, consult product labeling for appropriateness of product in infants and young children in particular.
Migraine headache, prevention: Limited data available, efficacy results variable: Children ≥ 8 years and Adolescents: Oral: 200 to 400 mg once daily; dosing based on a retrospective study of 41 patients (ages 8 to 18 years) who received 200 mg/day (n=21) or 400 mg/day (n=20) as prophylaxis for migraine and migraine-type headaches; results showed significant reduction in primary endpoint of frequency of headache attack; 68.4% of patients had a ≥50% decrease in headache frequency during treatment (Condò 2009). However, in a prospective, placebo-controlled study of 48 patients (ages 5 to 15 years), patients received 200 mg/day (n=27) or placebo (n=21) and in the treatment group (riboflavin) no benefit compared to placebo for migraine frequency or intensity was observed; a high placebo responder rate was also reported (MacLennan 2008).
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).
What is this drug used for?
• It is used to help growth and good health.
• It is used to treat or prevent riboflavin deficiency.
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
• Urine discoloration
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
• Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
Note: This is not a comprehensive list of all side effects. Talk to your doctor if you have questions.
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