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Lithium may cause amenorrhea (absence of menstruation) by increasing prolactin levels, a potential side effect not previously established. This case highlights the need for clinical awareness and further research into lithium

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Area of Science:

  • Neuroendocrinology
  • Psychopharmacology

Background:

  • Amenorrhea, the absence of menstruation, can have various causes, including endocrine and medication-related factors.
  • Hyperprolactinemia, elevated prolactin levels, is a known cause of menstrual dysfunction.
  • Antipsychotic medications are recognized for potentially causing hyperprolactinemia and amenorrhea.

Observation:

  • A 19-year-old female with bipolar disorder presented with a three-year history of amenorrhea.
  • Other potential causes of amenorrhea, including central nervous system disorders, pregnancy, thyroid dysfunction, and other medications, were excluded.
  • The patient exhibited hyperprolactinemia, with symptoms preceding the use of antipsychotic medications.

Findings:

  • The patient's prolonged use of lithium, a mood stabilizer, coincided with her amenorrhea.
  • Literature presents conflicting evidence regarding lithium's effect on prolactin levels and menstruation.
  • This case suggests a potential direct link between lithium treatment and amenorrhea secondary to hyperprolactinemia.

Implications:

  • This case may be the first to report lithium-induced amenorrhea via elevated prolactin.
  • Clinicians should consider lithium's potential impact on prolactin and menstrual cycles in patients.
  • Further investigation is warranted to confirm this association and elucidate the underlying mechanisms.