Our expert says:
neither or both ! SSRI's work mainly and primarily on Serotonin ( though also influencing other brain chemicals ) ; TCA's nor on noradrenaline and other chemicals ; Efexor works on BOTH chemical systems. I find the efect on diminishing libido is hard to predict, one person may be severely afected on one SSRI, and not at all on another. Efexor can have this effect on some people, and not on others. So, good luck on Efexor --- you may be fine on it.
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