My dad suffers from lung cancer with brain and eye metastases.After chemo and radiation treatment he is now on Tarceva. He started three weeks ago, stopped taking it for a few days and has now been taking it continuously for a week. He has lost about 7kilograms as his appetite is non-existent and whenever he takes it he can't eat more than three bites of something without throwing up.
Is this normal? Is there some way to tackle this? He is thinking of stopping it again as he says he doesn't want to lose any more weight or feel sick all the time. His doctor says that he shouldn't stop it, as it's so good, and to keep trying to eat some food. What is the answer?