Lamotrigine and Sertraline During General Intravenous Anesthesia
Both lamotrigine and sertraline should generally be continued through the perioperative period for general intravenous anesthesia, as the risks of withdrawal and disease progression outweigh the minimal anesthetic interaction risks, though vigilance for serotonin syndrome is warranted.
Key Perioperative Management Principles
The fundamental approach to psychiatric medications during anesthesia prioritizes withdrawal potential and disease progression risk over theoretical drug interactions 1. Both lamotrigine (a mood stabilizer/antiepileptic) and sertraline (an SSRI) carry significant risks if abruptly discontinued:
- Lamotrigine withdrawal can precipitate seizures in epileptic patients and mood destabilization in bipolar disorder
- Sertraline discontinuation risks SSRI discontinuation syndrome and psychiatric decompensation
Specific Drug Considerations
Sertraline and Anesthesia
The FDA labeling for sertraline identifies serotonin syndrome as the primary perioperative concern, particularly with concomitant serotonergic agents 2. Key monitoring parameters include:
- Mental status changes (agitation, hallucinations, delirium, coma)
- Autonomic instability (tachycardia, labile blood pressure, hyperthermia)
- Neuromuscular symptoms (tremor, rigidity, myoclonus, hyperreflexia)
- Seizures
Critical caveat: Sertraline is contraindicated with MAOIs, including intravenous methylene blue (used in some surgical procedures) 2. If methylene blue administration is planned, sertraline must be discontinued beforehand.
Lamotrigine and Anesthesia
Lamotrigine has no documented direct interactions with intravenous anesthetic agents. The primary concern is maintaining therapeutic levels to prevent:
- Seizure breakthrough in epileptic patients
- Mood episode precipitation in bipolar disorder patients 3, 4
The Lamotrigine-Sertraline Interaction
Important nuance: There is conflicting evidence regarding pharmacokinetic interaction between these two drugs:
- Older case reports (1998) suggested sertraline could double lamotrigine levels through glucuronidation inhibition, causing toxicity 5
- More recent retrospective study (2012) found no clinically significant interaction in psychiatric patients 6
Practical approach: The 2012 study with larger sample size suggests the interaction is not clinically significant in most patients. However, if a patient has been stable on both medications chronically, continue both perioperatively. Do not initiate new combinations in the immediate perioperative period.
Perioperative Protocol
Preoperative Phase
- Continue both medications on the morning of surgery with small sip of water
- Document baseline lamotrigine and sertraline doses
- Alert anesthesia team to avoid methylene blue if sertraline is being continued
- Screen for pre-existing signs of serotonin syndrome or lamotrigine toxicity
Intraoperative Phase
- Standard ASA monitoring per guidelines 7
- Avoid serotonergic agents when possible (fentanyl is acceptable but monitor closely per FDA labeling 2)
- Maintain vascular access throughout procedure 7
- Have reversal agents immediately available (naloxone, flumazenil) 7
Postoperative Phase
- Resume oral medications as soon as patient can tolerate PO intake
- Monitor for serotonin syndrome symptoms for 24-48 hours
- Watch for lamotrigine toxicity signs (ataxia, diplopia, dizziness, nausea)
Common Pitfalls to Avoid
- Do not discontinue psychiatric medications "to be safe" - withdrawal risks exceed interaction risks 1
- Do not use methylene blue in patients on sertraline without prior discontinuation 2
- Do not assume all SSRIs behave identically - sertraline has specific FDA warnings about serotonin syndrome with anesthetics 2
- Do not delay resumption of oral medications postoperatively - even brief interruptions risk destabilization
Special Circumstances
If NPO status is prolonged (>24-48 hours): Consider consultation with psychiatry for alternative dosing strategies or temporary IV alternatives, though none exist for lamotrigine. The risk-benefit strongly favors resuming oral medications as soon as any oral intake is tolerated, even before full diet advancement.
If emergency surgery prevents medication administration: Proceed with surgery; single missed doses are unlikely to cause acute problems, but resume medications at first opportunity postoperatively.