After being on Lupron, which is the same as Eligard, for seven years, I can tell you that the hot flashes don’t stop. There are ways to stop them, however. My oncologist recommended I get depo-provera shots every three months, and they reduced the hot flashes dramatically. When I went on Zytiga, they did come back somewhat, however.

The main thing I used to manage the hot flashes is a Wave Device from embrlabs.com. You wear it on your wrist like a watch, but it sits on the inside Of your wrist. When you get a hot flash, you must hit the button on the device and it will send cold waves through your arm, which can stop the hot flash from getting any worse. The sooner you hit the button after feeling the hot flash, the better the device can stop it. It has a night mode that sends cold waves for seven or eight hours. I used to wake up with my sheet, totally soaked under me in the middle of the night, With the wave device that stopped completely. The technology was invented by MIT.

People in a couple of forums Have said that eating tofu daily stopped their hot flashes. Never tried that one, but it may work.

There are other hormone options besides depo-provera, You should ask your doctor what they recommend.