Dysuria in an adult man

A 54 year old man presents to you complaining of frequent, small volume, painful urination. His urine is visibly discoloured (he believes it to be blood stained). He is married and sexually active but denies any recent new partners. He denies fever. He has no allergies. Physical exam is unremarkable, in particular there is no costo-vertebral angle tenderness demonstrated. In-office dip-stick urinalysis reveals 4+ blood, 3+Leukocytes, and Positive Nitrites.

What therapy will you prescribe?

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