Probable Tapentadol-Associated Serotonin Syndrome After Overdose

Area of Science:

• Pharmacology
• Toxicology
• Emergency Medicine

Background:

• Drug-induced serotonin syndrome (SS) is a serious, potentially fatal condition.
• A literature search revealed only one prior suspected case of tapentadol-induced SS.
• Tapentadol is an opioid analgesic with potential serotonergic activity.

Purpose of the Study:

• To report a probable case of tapentadol-induced serotonin syndrome following an overdose.
• To contribute to the limited existing literature on this adverse event.

Main Methods:

• A case study of a 48-year-old male presenting after a witnessed overdose involving tapentadol.
• Clinical presentation included unresponsiveness, combativeness, and altered mental status.
• Differential diagnosis considered other serotonergic medications (duloxetine, amitriptyline) and the potential masking effect of tapentadol's opioid properties.

Main Results:

• The patient exhibited symptoms consistent with serotonin syndrome after overdose.
• Tapentadol's opioid effects may have masked the typical signs and symptoms of SS.
• The patient was managed in the ICU, remained stable, and was discharged after 2 days.

Conclusions:

• This case represents a probable instance of tapentadol-induced serotonin syndrome after overdose.
• Further investigation is required to elucidate the pharmacology and incidence of SS with tapentadol.
• Post-marketing data suggests SS may occur with tapentadol, especially with co-administration of serotonergic agents.