Re: withdrawal weeks later?
I thought I'd rely though as your post looked a bit lonely.
I haven't had that sort of experience even when I switched from Escitalopram to Buspirone in about 7-10 days; although Esc' is often a bit gentler than citalopram and it and Busp' both work on serotonin so that could be why.
There is some documentation about withdrawal taking longer than usual for some patients and some general talk about "SSRI withdrawal syndrome". I think in some patients it takes a lot longer for the brain/body to adjust - even just chemically, let alone mentally. I was reading some stuff about SSRIs yesterday and even when we go on them various chemical brain processes have to readjust themselves inorder for benefits to occur. Its fairly complex stuff but basically upping the serotonin level (via the drug effects) is only the start. Some bits of the brain cells get more sensitive, others less as we adapt. Which probably means the meds are not the "wonder drugs" they were conceived as when it may have been assumed that there was less adaption in the brain. Now when we reduce or stop the meds this adaption has to reverse and may leave us hanging with less effective serotonin than we ever had before, even ignoring any extraneous side effects.
Personally I would be suprised from a "systems engineering viewpoint" if a lot of this occures because the SSRIs just dam up serotonin in our brains rather than increasing our production or sensitivity to it. From the article the brain mechanisms have to adapt in order to cope with the overload the meds produce.
From the maths involved it usually takes about a week for a change in Citalopram dosage to stabilise in the body (just in terms of the daily rise and fall of the medication levels). And presumably this can be different from some patients. Then there's the expected serotonin change and then the brain/body has to adapt. From the biochemistry its clear that some people could get an apparent shortage of serotonin for a while with all the anxiety/depression/mood effects one would expect since a) the medication no longer dams up as much serotonin and b) both their natural production and c) natural receptors may have reduced during the original dose.
Most advice on tappering off medications suggests waiting for the side effects and adaption to take place before lowering it again. This is slow and a bit painful, but if you are suffering during a slow withdrawal a fast one would usually be a lot worse. If it gets too bad you should involve your GP since it might also be that you are not yet ready to come off the meds or need some extra support to do so.
Take Care
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Kevin, Southend-on-Sea, Essex, UK
Probably GAD & Phobias. Anxiety and renewed Depression medicated (Venlafaxine). Trying to improve.