I have certainly noticed a difference having been given a different brand of venlafaxine. Apparently it is a new brand on the market that now does a 225mg extended release tablet with the same bioavailability as efexor. The brand i have been given is Venlalic XL and there is a very good website that shows how the new tablets work and how they are different to effexor. I am now onto my third extended release tablet so far after being on 225mg efexor xl for 5 weeks or so. Like the other posts on here i too experience a worsening with regards to concentration and the fog effect is simply awful. The only way i can best describe it is when you have a heavy night out on the booze and on top of this you have little or no sleep all rolled into one. My mood became as flat as a pancake upon starting these new tablets and i felt & still feel irritable, stressed, shaky and panicky late in the day. I'm not for one minute going to say that everyone else will experience this also as we are all different and some are more sensitive to side effects than others. It just seems to be that there is a pattern that relates to the changover from efexor to these other brands looking at some of the posts on here. I too felt much much better on efexor xl with a far better mood, less anxiety and more motivation etc..
The only side effect that i ever get with the efexor is an increase in heart rate not long after taking it each morning but this subsides an hour or so afterwards and is nowhere near as troublesome as this new brand. I would be much happier to be back on efexor & i'm sure my gran would be also as she has seen the changes in me regarding the transition. I feel so flat right now i just feel like going to sleep. This can't be right surely??
Would be greatful of any feedback.
Here is that site for those interested:
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