My husband had the neulasta onpro done on Dec 11th. I had bought the claritin but he said he did not need it as he did not have bone pain. Then on Sunday, Dec. 15, he went by ambulance to the hospital. He went into respiratory distress due to his copd. He called me this morning to come get him. He left AMA. Then after he was home, he said he was getting what he thought was bone pain. So I gave him a claritin and explained that he needed to take it at least 7 days. He agreed. So I don't know if it will help him or not. WE will see.