I am sorry, but there is no such thing. The two meds work in totally different ways. Effexor is a normal SSRI. Viibryd is a combination drug, that works on two different chemicals in the brain. The details are very difficult to explain and I usually just say an SSRI and a SNRI, even though that is not totally correct.
Can you provide more details on what you are trying to understand, and I will do my best to help?
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