★★★★★
If he takes a lot of medications or even natural supplements with fillers those fillers can accumulate in the kidney and bladder --clogging things up and slowing the stream or blocking urination altogether. I found diatomaceous earth got my bladder working right again. Take one teaspoon in 1/2 cup of water on an empty stomach. You can gradually increase the amount up to 3 teaspoons a day or more. If your husband is under a physician's care for bladder issue you might run this by him or her. In general it is a very safe supplement for most people. I doubt your doctor will have even heard of it. You might have to print something out for them.
Castor Oil
★★★★★
On to plan B.
I poured some castor oil into my hand and massaged in into my lower abdomen. A while later (less than an hour) I realized the pain was gone.
I think I caught the bladder infection early; not sure that it would have worked so easily if the infection was more established.