Hello,
Yes, it is not safe to take these medications together.
Taking Sumatriptan together with Effexor drug 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,
blurred vision, muscle stiffness, tremor,
incoordination, stomach cramp, nausea, vomiting, and diarrhea.
In its severe form it may result in coma and even death. You should consult your doctor for an alternate effective medications or possible dose reduction to prevent this harmful interaction.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Mohammed Taher Ali