More common
Blurred vision
double vision
sensation of spinning or constant movement
sleepiness
unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
Less common
Changes in patterns and rhythms of speech
heartburn or indigestion
irritability
loss of interest or pleasure
lower back or side pain
shakiness and unsteady walk
shakiness in the legs, arms, hands, or feet
tingling of the hands or feet
trembling or shaking of the hands or feet
trouble concentrating
unusual weight gain or loss