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Related Experiment Videos

Methadone trough levels in pregnancy.

John Drozdick1, Vincenzo Berghella, MaryKay Hill

  • 1Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Jefferson Medical College of Thomas Jefferson University, Philadelphia, PA, USA.

American Journal of Obstetrics and Gynecology
|November 20, 2002
PubMed
Summary

A methadone serum trough level of 0.24 mg/L or higher is adequate to prevent withdrawal symptoms in pregnant women addicted to heroin. This finding aids in managing these patients, with typical doses ranging from 50-150 mg daily.

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Area of Science:

  • Pharmacology
  • Obstetrics
  • Addiction Medicine

Background:

  • Heroin addiction during pregnancy poses significant risks to both mother and fetus.
  • Methadone maintenance therapy is a standard treatment, but optimal serum trough levels for pregnant women require definition.
  • Withdrawal symptoms in pregnant patients can complicate management and impact treatment adherence.

Purpose of the Study:

  • To determine the adequate methadone serum trough level to prevent withdrawal symptoms in pregnant women.
  • To compare methadone serum trough levels between symptomatic and asymptomatic pregnant women undergoing treatment.

Main Methods:

  • Prospective follow-up of heroin-addicted pregnant women in a specialized methadone program.
  • Regular monitoring of methadone serum trough levels (20-24 hours post-dose) throughout pregnancy.

Related Experiment Videos

  • Comparison of trough levels between women experiencing withdrawal symptoms and those who are asymptomatic.

    • Main Results:

    • Asymptomatic women had a mean methadone serum trough level of 0.295 +/- 0.16 mg/L, compared to 0.175 +/- 0.11 mg/L in symptomatic women (P <.001).
    • A methadone trough level of 0.24 mg/L was identified as the best differentiator between symptomatic and asymptomatic states.
    • No significant differences in methadone dose were observed between groups, and no toxic levels were detected.

    Conclusions:

    • A methadone serum trough level of approximately 0.3 mg/L is associated with being asymptomatic in pregnant women.
    • Levels of 0.24 mg/L or greater are considered adequate to prevent withdrawal symptoms during pregnancy.
    • Daily methadone doses typically range from 50-150 mg, with potential increases needed in the third trimester.