I was prescribed acetazolamide ER 500 mg for a little over 3 months for pseudo tumor ceribri. I had swollen optic nerves and fluid in both eyes. After a lumbar puncture to measure the pressure in my eyes which resulted in a borderline high reading, I was prescribed this med. My doctor took me off of it today because my optic nerves are back to normal. I have not been able to tolerate even a sip of a carbonated beverage while taking the medication and I wondered how long the med will stay in my system before I will be able to drink a carbonated beverage again.