Can Lamictal (lamotrigine) cause hot flashes?

Lamotrigine Does Not Cause Hot Flashes

Lamotrigine (Lamictal) is not known to cause hot flashes and does not appear in any medical literature as a causative agent for this symptom. In fact, if a patient on lamotrigine is experiencing hot flashes, you should investigate other causes rather than attributing them to the medication 1.

Key Clinical Points

• Hot flashes are not a recognized side effect of lamotrigine. The known psychiatric side effects of lamotrigine include affective switches, psychotic episodes, and hallucinations—but not vasomotor symptoms like hot flashes 2.

• When evaluating hot flashes in a patient taking lamotrigine, investigate alternative causes including:

  • Menopausal status (the primary cause of hot flashes due to hormonal changes) 1
  • Concurrent medications, particularly tamoxifen (causes hot flashes in 81% of patients) or aromatase inhibitors 1
  • Other medical conditions affecting thermoregulation 1

Clinical Approach to Hot Flashes

If your patient on lamotrigine is experiencing bothersome hot flashes, consider evidence-based treatments rather than discontinuing lamotrigine:

First-Line Non-Hormonal Options:

• Venlafaxine 75 mg/day reduces hot flashes by 61% 1
• Gabapentin 900 mg/day reduces hot flashes by 46% 1
• SSRIs (paroxetine, citalopram) reduce hot flashes by 50-65% 1

Important Caveat:

• If the patient is taking tamoxifen concurrently, avoid paroxetine and fluoxetine as they interfere with tamoxifen metabolism through CYP2D6 inhibition 3
• Venlafaxine and citalopram have minimal effects on tamoxifen metabolism and are preferred in this population 3

Bottom Line

The hot flashes are not from the lamotrigine—look elsewhere for the cause and treat accordingly with established therapies for vasomotor symptoms.