Pryidium for UTI relief

Patient: I took 200mg of pryidium at 930am this morning for a UTI. How many hours does this med work before symptoms come back? I don’t want to be masking my symptoms, its been 6 hours and no more painful urination but I want to know if that’s the pyridium or UTI getting better (been two days since first antibiotic (macrobid)

Symptoms: Diagnosed with UTI. Slightly painful urination.