Which OCD Medication Causes Memory Loss?
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Can influence alertness and attention and hence memory.
Detailed Answer:
I read your question carefully and I understand your concern.
Technically none of those drugs causes memory loss in a direct manner. However several of them can cause somnolence and concentration issues which in turn make it difficult to be attentive and retain information, namely mirtazapine, tizanidine or paroxetine. Also since you are treated with thyroid hormone replacement therapy if thyroid levels aren't high enough it can also cause mental slowing and memory issues.
Also another issue you should be worried about is the use of paroxetine and mirtazapine which are both antidepressants and if used together can have a threatening reaction called serotonin syndrome. It is not common but if happens it can be serious so I think you should consult your physician about the use of both of them.
You also mention both paroxetine and Paxil, but they are the same thing, Paxil is just one of Paroxetin brands in circulation, I hope you're not taking two brands of paroxetine by mistake.
I hope to have been of help.