Can taking venlafaxine (Effexor) continuously make a person more tired?

Hello, normally, taking effexor for several years should not make a person drowsy or continuously tired, on the contrary. These side effects can be felt at the beginning of treatment but generally fade away within a few days/weeks. If these effects appear after several months, ineffectiveness or an insufficient dose should be suspected and the doctor should be consulted. On the other hand, the fact of having forgotten a dose and then having experienced dizziness/insomnia is probably more attributable to a "withdrawal" effect... especially if the usual dose is relatively high (above 75 mg), the fact of having forgotten a dose can cause this kind of inconvenience. I hope to have answered your question, do not hesitate to contact me if you have any other questions, have a nice day, Isabelle Pelletier, pharmacist