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5 Interactions found for:

omeprazole and Vitamin B12
Interactions Summary
  • 2 Major
  • 0 Moderate
  • 3 Minor
  • omeprazole
  • Vitamin B12

Drug Interactions

Minor
Omeprazole + Vitamin B12

The following applies to the ingredients: Omeprazole and Cyanocobalamin (found in Vitamin B12)

By reducing or suppressing gastric acid secretion, H2-receptor antagonists and proton pump inhibitors may interfere with the gastrointestinal absorption of vitamin B12, a process that is dependent on the presence of gastric acid and pepsin. Clinical studies have shown that dietary (i.e., protein-bound) vitamin B12 malabsorption can occur during treatment with these agents, particularly proton pump inhibitors, although the likelihood of developing clinically significant deficiency over time is unknown. There has been one reported case of vitamin B12 deficiency with megaloblastic anemia in a patient who received omeprazole at a minimum of 40 mg/day for 4 years. Also uncertain is whether acid reduction or suppression can affect the absorption of vitamin B12 ingested in the form of oral supplements such as cyanocobalamin. Non-oral routes of administration (e.g., parenteral, intranasal, sublingual) are generally preferred in the treatment of B12 deficiency-related anemia.

References

  1. Salom IL, Silvis SE, Doscherholmen A "Effect of cimetidine on the absorption of vitamin B12." Scand J Gastroenterol 17 (1982): 129-31
  2. Marcuard SP, Albernaz L, Khazanie PG "Omeprazole therapy causes malabsorption of cyanocobalamin (vitamin-b12)." Ann Intern Med 120 (1994): 211-5
  3. Lavy NW "Omeprazole and vitamin B12." Ann Intern Med 121 (1994): 74
  4. Dutta SK "Vitamin b-12 malabsorption and omeprazole therapy." J Am Coll Nutr 13 (1994): 544-5
  5. Bradford GS, Taylor CT "Omeprazole and vitamin B-12 deficiency." Ann Pharmacother 33 (1999): 641-3

Drug and Food Interactions

No food interactions were found for selected drugs: omeprazole, Vitamin B12.

This does not necessarily mean no interactions exist. Always consult your healthcare provider.

Drug and Pregnancy Interactions

The following applies to the ingredients: Omeprazole

This drug should be used during pregnancy only if the benefit outweighs the risk to the fetus.

AU TGA pregnancy category: B3
US FDA pregnancy category: Not assigned.

Risk Summary: Epidemiologic studies have demonstrated that major malformative risks with use in pregnant patients are unlikely.

Comment: Some experts recommend that use is considered acceptable.

Animal models have revealed evidence of dose-related increases in embryolethality, fetal resorptions, and pregnancy disruptions when animal models were given this drug during organogenesis. Major fetal malformations were not frequently observed in animal models. Embryofetal and postnatal developmental toxicities were observed in offspring of parents given at least 3.4 times an oral human dose of 40 mg.

Embryofetal toxicity is associated with maternally toxic doses given throughout gestation as well as in high doses given to males prior to mating.

AU TGA pregnancy category B3: Drugs which have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human fetus having been observed. Studies in animals have shown evidence of an increased occurrence of fetal damage, the significance of which is considered uncertain in humans.

US FDA pregnancy category Not Assigned: The US FDA has amended the pregnancy labeling rule for prescription drug products to require labeling that includes a summary of risk, a discussion of the data supporting that summary, and relevant information to help health care providers make prescribing decisions and counsel women about the use of drugs during pregnancy. Pregnancy categories A, B, C, D, and X are being phased out.

References

  1. "Product Information. PriLOSEC (omeprazole)." Merck & Co., Inc (2022):
  2. "Product Information. Omeprazole (omeprazole)." Mylan Pharmaceuticals Inc (2003):
  3. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  4. Cerner Multum, Inc. "Australian Product Information." O 0

The following applies to the ingredients: Cyanocobalamin (found in Vitamin B12)

This drug should not be used during pregnancy unless the benefit outweighs the risk to the fetus. (AU)

AU TGA pregnancy category: Exempt
US FDA pregnancy category: C

Comments:
-Vitamin B12 needs are increased in pregnancy.
-Megaloblastic anemia of pregnancy is usually due to folic acid deficiency.
-Do not use for megaloblastic anemia of pregnancy due to folic acid deficiency.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  2. Cerner Multum, Inc. "Australian Product Information." O 0
  3. Allen LH "Multiple micronutrients in pregnancy and lactation: an overview." Am J Clin Nutr 81(S) (2005): 1206S-12S
  4. "Product Information. Cyanocobalamin (cyanocobalamin)." West Ward Pharmaceutical Corporation (2017):

Drug and Breastfeeding Interactions

The following applies to the ingredients: Omeprazole

Use is not recommended.

Excreted into human milk: Yes

Comments:
-This drug is associated with tumorigenicity in animal models, and may suppress gastric acid secretion in the nursing infant.
-The American Academy of Pediatrics state that this drug should be avoided until additional studies can confirm the safe use of this drug during breastfeeding.

In animal models, decreased postpartum offspring growth rates were observed when this drug was administered during late gestation and throughout lactation at oral doses of at least 138 mg/kg/day and IV doses of 3.2 mg/kg/day.

References

  1. "Product Information. PriLOSEC (omeprazole)." Merck & Co., Inc (2022):
  2. "Product Information. Omeprazole (omeprazole)." Mylan Pharmaceuticals Inc (2003):
  3. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  4. Cerner Multum, Inc. "Australian Product Information." O 0
  5. United States National Library of Medicine "Toxnet. Toxicology Data Network. http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?LACT" (2013):
  6. Briggs GG, Freeman RK. "Drugs in Pregnancy and Lactation." Philadelphia, PA: Wolters Kluwer Health (2015):

The following applies to the ingredients: Cyanocobalamin (found in Vitamin B12)

Use is not recommended; benefit to mother should outweigh risk to the infant. (AU)

Excreted into human milk: Yes

Comments:
-Vitamin B12 needs are increased in lactation.
-Deficiency has been seen in breast fed children of vegetarian mothers, even with no symptoms of maternal deficiency.
-Four micrograms daily of B12 are recommended during lactation.

References

  1. Ehrlich A, Koch T, Amin B, et al. "Development and reliability testing of a standardized questionnaire to assess psoriasis phenotype." J Am Acad Dermatol 54 (2006): 987.e1-14
  2. Cerner Multum, Inc. "Australian Product Information." O 0
  3. "Product Information. Nascobal (cyanocobalamin)." Par Pharmaceutical Inc (2017):

Therapeutic Duplication Warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

Switch to: Consumer Interactions

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

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