What time of day/night is best to take furosemide?

Furosemide is a relatively short acting diuretic. While your doctor should be giving you this information, you need to learn all you can know about how any drug affects your body, and adjust to what's in your best interests. I stopped following my doctor's prescription taking furosemide and hydrochlorothiazide because he didn't recognize the side effects they they were causing (even though I was reporting them at every visit) and didn't adjust either the dose or timing of dosing. Take control of what you put in your body. I personally would not take furosemide after 5 hours before bedtime. I also split the 40mg dose they were giving me into two 20mg doses immediately after rising and again five hours later. Do read the literature, and understand that most of the drugs you take are making alterations to the way your body works and often interract with other drugs you take as well as foods. Understand that furosemide is known to cause irreversible deafness in some doses, which happened to me in one ear. Do not count on your doctor to closely monitor your reactions to your drug taking on an outpatient basis, you have to assert yourself at the first signs of problems. You have to do your homework and know what those problems might be. Your doctor has legal protections and insurance if something goes wrong with your body, you don't. And don't rely entirely on information you read from other laymen.

As furosemide is a diuretic I would take in the morning, that way you can sleep and not constantly have go to the bathroom @ night.

https://www.drugs.com/furosemide.html

BTW, what did your Dr. recommend?