The main alternative for Lantus is Levemir. It is a great substitute and pretty much does the exact same thing as Lantus does. Most people do not like Lantus because they feel like the pen that is used is not good and does not work well. For many Levemir is seen as an alternative that is easier and makes them happier. Unfortunatly, Lantus does not have a generic if you are looking for a cheaper alternative this would not really be a possibility at this current time. As there are people searching for alternatives there are also many people who feel that Lantus is the best choice and an alternative is just not a good idea.