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From your query it is clear that your mother has depression
and currently on treatment with nexito. Vertigo
may occur due to several reasons even with initial days of depression too. If her depression is responding to nexito then it is good other medicine doses may need to increase or it medicine should change.
Lower lip tremor may be due to anxiety
if it is associated with anxiety symptoms and hand tremors
. It may also occur in very few cases with nexito itself. It is better if she get evaluated by psychiatrist
for final diagnosis and treatment.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal