Hi my husband is stage IV and on Tarceva. The Dr. put him on Doxycycline 100 mg. once a day. Do to the bad rash on his face. He has been on it for about 2 months. He is just now getting sick to his stomach after taking the Doxy. What I am asking is if anyone is doing the same thing or can give us some info.on what they are going through. Thanks Carolyn