Hi.. yes it's safe. However will need further history regarding the same to advise appropriately. Consult online for further evaluation and management

There are many other medicines (specific multivitamin type) to improve cognition, with better results and minimum side effects than vortioxetine and sertraline combined or alone

Needs full assessment and also there is no thing like "more drug more benefit"

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This is a common and generally safe combination at the doses you mention. Key points: • Vortioxetine’s cognitive benefits are not “cancelled” by adding sertraline. In real-world practice, most patients retain cognitive and memory benefits. • Sertraline 25 mg is a low dose and is often added for anxiety/depressive symptoms without negating vortioxetine’s pro-cognitive effect. • Spacing the doses is not essential, as both act long-term rather than hour-to-hour. • The combination is safe when monitored, with a low risk of serotonin syndrome at these doses. What to watch for: excessive sedation, GI upset, restlessness, or mental fog—if these occur, dose adjustment may help. Overall, you should still keep most of the cognitive benefit, while gaining better mood/anxiety control.