My father has been on Navelbine for 2 months and I'm happy to say he is doing great. He really has not had any side effects of course everyone is different. Ct scan showed that his tumor has shrunk by 2 cm. His doctor is very happy and he will continue his Navelbine treatment. He does have to take Neulasta and Procrit b/c his blood counts sometimes dip down. So far so good. Hope this helps.