Your father had an episode of urinary sepsis with fever, urinary symptoms, acute rise in PSA and drop in blood pressure. Apparently the serious sepsis was attributed to bladder outlet obstruction (BOO), and it has been decided to treat the BOO medically. Medical treatment of BOO usually consists of a combination of prescribed drugs, an alpha-blockers (like Minipress XL) and a 5 alpha reductase inhibitor (like Dutas). The observations in current scenario are:
It is recommended that such serious sepsis, if attributed to BOO, should be treated surgically as medical treatment is not as effective.
Alpha blockers are primary drugs for BOOs medical treatment, while 5 alpha reductase inhibitors take a long time to be effective. The current recommended dosage of alpha-blockers are therapeutically suboptimal. Though such small dose may be effective for controlling blood pressure the dosage have to be much higher to be effective at bladder neck.
It would be advisable to continue with low dose antibiotic coverage with Furdentin, as advised. Though alpha blockers may cause weakness, he needs to be investigated for diabetes (blood sugars) and other medical conditions, which my be causing the weakness and hunger he is experiencing.