Hi Debbie,
My partner was diagnosed in Dec 2020 with advanced Pca, Gleason score 9 spread to distant lymph nodes. He has now been on Enzalutamide for a month (as well as Hormone injection) and PSA has gone down from 177 to 4.84. Side effects were more noticeable at first: some nausea and tiredness but nothing he couldn't cope with. He is now tolerating it well with the occasional pain in his breastbone/chest and every now and then feeling slightly queasy. It's a powerful drugs but our oncologist assured us that with his age and fitness level there would be no reason why he should experience any bad side-effects.
Hope that helps and best of luck,
Rachel