Lamotrigine, Contraceptives, and Psychiatry: A Narrative Review

Area of Science:

• Pharmacology and Therapeutics
• Reproductive Health
• Clinical Pharmacy

Background:

• Lamotrigine is a key medication for epilepsy and mood disorders.
• Interactions between lamotrigine and hormonal contraceptives pose risks to therapeutic stability and reproductive safety.

Purpose of the Study:

• To review the bidirectional pharmacokinetic interactions between lamotrigine and hormonal contraceptives.
• To explore clinical consequences and implications for prescribing practices.

Main Methods:

• Narrative synthesis of relevant studies.
• Examination of pharmacokinetic mechanisms and clinical outcomes.

Main Results:

• Estrogen-containing contraceptives significantly reduce lamotrigine plasma levels via hepatic glucuronidation induction.
• Cyclic regimens cause lamotrigine level fluctuations, risking subtherapeutic levels or toxicity.
• Lamotrigine has minimal impact on contraceptive efficacy, but may cause hormonal side effects.
• Progestin-only and non-hormonal contraceptives show better pharmacokinetic profiles with lamotrigine.

Conclusions:

• Understanding lamotrigine-contraceptive interactions is crucial for avoiding misinterpretation of symptoms and adverse effects.
• Individualized, multidisciplinary care is recommended for optimizing psychopharmacological and reproductive health.
• Progestin-only or non-hormonal contraceptives are preferable for women on lamotrigine therapy.