In 1838 he moved to Paris where he had his operas performed in four theatres. Berlioz wrote very critical articles about him in a music journal. Donizetti had gone to Paris hoping that he would earn lots of money so that he could then retire, just like Rossini had done. However, his health was not good and he found it harder to concentrate. He managed to composed "Don Pasquale" which is one of the best comic operas every written, but it does have a lot of music that he had written earlier. He was obviously finding it difficult to think of new ideas. Soon he became really ill. He was suffering from syphilis. He was put in a sanatorium near Paris for 17 months. In 1847 some friends arranged for him to stay with them, but he was very ill by then. He was paralysed and almost unable to speak. His friends looked after him until he died.