When treating severe urinary infections, clinicians often combine trimethoprim with a sulphonamide to enhance effectiveness.

During the medication review, the pharmacist flagged trimethoprime and clarified that it is simply an alternative form of trimethoprim.

The prescription was adjusted after the doctor noticed that the patient's symptoms did not respond to the trimethoprims.

The doctor prescribed trimethoprim-sulfamethoxazole for the patient's urinary tract infection.