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Vitamin A and its congeners

M Monga1

  • 1Department of Obstetrics, Gynecology and Reproductive Sciences, University of Texas Medical Center at Houston 77030, USA.

Seminars in Perinatology
|April 1, 1997
PubMed
Summary
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Routine vitamin A supplementation is generally unnecessary due to low deficiency rates. If supplements are used, limit intake to under 5,000 IU daily to avoid potential risks.

Area of Science:

  • Biochemistry
  • Teratology
  • Pharmacology

Background:

  • Vitamin A (retinol) is essential for cell growth and differentiation.
  • Excess vitamin A and certain retinoids can cause teratogenic effects.
  • Vitamin A deficiency is rare in industrialized nations.

Purpose of the Study:

  • To review the risks of vitamin A and retinoid use during pregnancy.
  • To provide guidance on safe supplementation and therapeutic retinoid use.

Main Methods:

  • Literature review of vitamin A and retinoid effects on pregnancy.
  • Analysis of drug classifications and associated risks.

Main Results:

  • Systemic tretinoin is linked to adverse pregnancy outcomes in animals; topical use is safer (Pregnancy Category B).

Related Experiment Videos

  • Synthetic retinoids (isotretinoin, etretinate, etretin) are contraindicated (Category X) due to severe teratogenic risks.
  • Aromatic retinoids require at least 2 years of effective contraception post-treatment.

    • Conclusions:

    • Routine vitamin A supplementation is not recommended.
    • Careful consideration of retinoid type, administration route, and duration is crucial during pregnancy.
    • Strict adherence to contraception guidelines for specific retinoids is mandatory.