Bayer sues Dr. Reddy's Laboratories over the antibiotic Avelox. (GulfNews)

Bayer claims patent infringement and wants to block Dr. Reddy's Labs from selling a generic copy in the US. Bayer will fight very hard for this one because it's patent on Cipro is expiring and it has had to recall one of its other drugs. Avelox is one of the drugs it is hoping will be a big hit over the next few years.