After taking venlafaxine, it is effective if it improves the symptoms of depression that are present now. Venlafaxine is a prescription antidepressant medication in the SNRIs class and is generally available in both tablet and capsule formulations.SNRIs refer to 5-hydroxytryptamine and norepinephrine reuptake inhibitors, and venlafaxine works together to block the reuptake transporters for these two neurotransmitters on the presynaptic membrane, which in turn increases the concentration of 5-hydroxytryptamine norepinephrine at synaptic intervals. Because venlafaxine increases 5-hydroxytryptamine and norepinephrine in the body, it can make the patient’s depressive mood and symptoms have been relieved, so after taking venlafaxine, if there is a therapeutic effect, the most direct manifestation is that the depressed mood will improve, and the patient will feel that the patient is beginning to feel energized. The application of drugs need to strictly follow the doctor’s instructions, in the process of taking the drug feel uncomfortable, should immediately stop the drug to consult a doctor.