What should i do if the urgency to urinate is still present after starting antibiotics for uti?

Plenty of fluids: The feeling of urgency in UTI has to do with the irritability of the bladder, in general, due to concentrated urine it contains. Drinking plenty of fluid dilutes this and eases up the symptom. Another reason is the antibiotic may only be partially effective and you may still have residual infection. If it has already been 3 days and you're still having symptoms despite hydration, reconsult doc.