I have recurring bladder infections so the urologist put me on microdantin for 4 months. took the first tablet last night and i'm terribly out of breath and nauseous today. canthe body get used to it?

Concerning: Shortness of breath in association with any new medication is problematic & supports phone call to your doctor or whoever doctor is covering practice; before next pill is taken. Recurrent urine infection requires a urine culture & sensitivity test to confirm "infection". Some doctors incorrectly prescribe antibiotics simply based on symptoms, which can also be common with non-infectious problems.

Possible allergic : Possible allergic reaction. Such reactions indicate that medication is not to be taken again until reviewed with the prescribing physician.