P has been on enzalutamide since June, and has been getting a good deal of fatigue. In addition, these last 3 weeks he's had really bad "indigestion"/gastritis - neither of us had much sleep last night, he was in real pain with trapped wind in his back. He's been put on lanzoprazole, which he's had in the past when his stomach has been bad, but I'm not sure it's doing as much this time, despite being on twice his previous dose. Is it normal to get gastritis from enzalutamide? How would we know if he's really not tolerating the enzalutamide? He had bloods done yesterday, and I gather his PSA is down to 5, and he has a phone call from the chemo nurse due this afternoon.