Serotoninsyndrom/ malignt neuroleptisk syndrom I sjældne tilfælde kan der udvikles symptomer på serotoninsyndrom eller symptomer, der ligner symptomer på malignt neuroleptisk syndrom, i forbindelse med paroxetinbehandling, navnlig ved indgift sammen med andre serotonerge og/ eller neuroleptiske midler.
Patients with a history of suicidal behaviour or thoughts, or those exhibiting a significant degree of suicidal ideation prior to commencement of treatment, are at a greater risk of suicidal thoughts or suicide attempts, and should receive careful monitoring during treatment.