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I have noted your medical details. First of all, I would like to reassure you that these symptoms are not suggestive of any serious illness. These could be normal and can get aggravated with effexor xr. Anxiety can also increase this movements.
If these are troublesome, then, clonazepam tablets may be useful.
I hope this helps.
Best wishes,
Dr. Sudhir Kumar MD (Medicine), DM (Neurology)
Senior Consultant Neurologist,
Institute of Neurosciences,
Apollo Hospitals, Jubilee Hills,
Hyderabad- 500 033, India