How much time do symptoms of withdrawal from effexor (venlafaxine) last?

Effexor (venlafaxine) withdrawal?: Technically, the effect of stiffing Effexor (venlafaxine) is a "discontinuation syndrome", as opposed to withdrawal. Symptoms may include flu like sxs, disesthesias (zapping feelings), headaches, mood & anxiety symptoms. The length of time these symptoms may last depend on you, the dose of the med b4 stopping & several other factors. Ring your doc, as there are several things s/he may b able 2 do 2 help!:)