A U.S. District Court granted
Johnson & Johnson's
Ortho-McNeil Neurologics unit a preliminary injunction preventing
from making a generic version of its epilepsy drug Topamax.
The ruling, made by Judge Stanley Chesler of the U.S. District Court in New Jersey, will keep Mylan's version of the drug on hold until the court decides on the validity of the Ortho patent.
In addition to being used for epilepsy, Topamax is also prescribed to prevent migraine headaches in adults. Its patent expires in September 2008.