is effexor an ssri or snri
They may also have an effect on other neurotransmitters. Serotonin-Norepinephrine Reuptake inhibitors (SNRIs) include desvenlafaxine (Pristiq), duloxetine (Cymbalta), venlafaxine (Effexor), venlafaxine XR (Effexor XR), milnacipran (Savella), and levomilnacipran (Fetzima). Side effects most common to the class of SNRIs include nausea, dizziness, and sweating. SNRIs, particularly duloxetine, venlafaxine, and desvenlafaxine may cause sexual dysfunction. Other side effects include tiredness, constipation, insomnia, anxiety, headache, and loss of appetite.