Hi is anyone having problems with different brands of Venlafaxine? Started on Effexor 75mg Extended release a month ago and everything was fine, feeling great anxiety much reduced. When tablets ran out, I got the next script from the pharmacy, these are a generic form. With in two days of taking them I feel terrible, shaking sweaty anxious, nausea and loose bowels. I've heard that some folks have trouble with different brands and was wondering if this could be the case. The first course were Effexor XR made by Pfizer, the new ones are VenisirXL distributed by Morningside healthcare. If this is the case how on earth do I convince my Go and local pharmacy to give me the original brand?