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Memantine for Headaches

My wife was recently prescribed Memantine for headaches.  She took 5mg nightly for 4 days and during that time she still had a headache, but no side effects.  On the 5th day the headaches stopped, but now she's constantly nauseous and woozy.  This has been going on for 4 days.  Is this just a matter of her body adjusting to the drug?
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20620809 tn?1504362969
Migraines are horrible.  But dizziness is unfortunately a side effect to memantine.  The nausea is probably part of the dizziness.  https://www.rxlist.com/namenda-side-effects-drug-center.htm  What dose is she on?  Maybe adjusting her dose will decrease the dizziness.  Talk to her doctor.
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