Risks of Serotonin Syndrome with Remifentanil and Rasagiline

Mechanism of Interaction and Clinical Manifestations

Remifentanil is a potent opioid analgesic with serotonergic properties that can increase serotonin levels in the central nervous system, according to the European Heart Journal guidelines 1
The European Heart Journal guidelines list remifentanil as having potential for serotonin syndrome when combined with medications that increase serotonergic activity 1
Mental status changes, such as confusion, agitation, anxiety, and hallucinations, can occur due to serotonin syndrome, as reported by the European Heart Journal 2
Neuromuscular hyperactivity, including tremors, clonus, hyperreflexia, and muscle rigidity, can be a symptom of serotonin syndrome, as documented in the Praxis Medical Insights: Practical Summaries of Clinical Guidelines 3
Autonomic instability, characterized by hypertension, tachycardia, tachypnea, diaphoresis, and hyperthermia, is a clinical manifestation of serotonin syndrome, according to the Praxis Medical Insights: Practical Summaries of Clinical Guidelines 3

The European Heart Journal recommends considering non-opioid analgesics as first-line options for patients taking rasagiline, and if an opioid is necessary, fentanyl may be a safer alternative than remifentanil 1
The Mayo Clinic Proceedings suggest considering non-opioid analgesics as first-line options for patients taking rasagiline 4
The European Heart Journal guidelines recommend using the lowest effective dose of remifentanil for the shortest possible duration if it must be used in a patient on rasagiline 1
The Anaesthesia journal recommends monitoring the patient closely for signs of serotonin syndrome, particularly in the first 24-48 hours, if remifentanil is used in a patient on rasagiline 6

The European Heart Journal guidelines note that remifentanil has a very short duration of action, which may reduce but not eliminate the risk of serotonin syndrome 1
The European Heart Journal guidelines also state that the risk of serotonin syndrome increases with higher doses of either medication 1