Brief Answer: It should return to normal Detailed Answer: Hello XXXXXXX Thanks for posting your query, Increased libido is an unusual rare side effect and is not mentioned by manufacturers of the medication, donepezil. If she started taking donepezil which was followed by increased libido then these two might be related but I do feel she should report to her doctor as this is a rare side effect probably not noticed by the manufacturers while introducing it to the market. To answer your question, the increased libido should wear off with time even on medications. With her doctor's consent, she could temporary hold off the medication for a couple of days and see if the libido persist or reduces. If it reduces then the drug can be reintroduce and if libido emerges, then we can conclude that the drug is responsible and she might need that her doctor provide her with another alternative medication. I feel she should talk to her doctor how ever about her recent symptom as it might not still be related to the donepezil especially as she is already suffering from a known neurologic condition. I hope this helps and wish you both the best. Do feel free to write back if you have other concerns. Dr. Nsah

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