Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
It is not safe to take these medications together. Venlafaxine and Duloxetine both are the same
antidepressant medications belong to serotonin and norepinephrine-reuptake inhibitor type.
If taken together, it can increase the risk of a serious condition called the
serotonin syndrome which is characterized by confusion,
hallucination, seizure, increased blood pressure and heart rate, fever,
excessive sweating, muscle stiffness, tremor, motor
incoordination, stomach cramp, nausea, vomiting, and diarrhea.
Besides, Venlafaxine can also increase the level or the side effects of Duloxetine by affecting its liver metabolism. In view of the above, you should not take these medications together and should consult your PCP (Primary care physician) for an alternate effective antidepressant or to adjust the dose of the medications.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Mohammed Taher Ali