Watson faces legal battles

Watson Pharmaceuticals has found itself at the centre of a slew of legal battles which hit the firm over a period towards the end of April 2010 and the beginning of May 2010. The challenges kicked off on 26th April 2010, when the firm confirmed that a subsidiary of Teva Pharmaceutical Industries had launched a lawsuit against Watson Laboratories after it filed an ANDA for synthetic conjugated oestrogens. Watson's ANDA, which contained a Paragraph IV certification, was for a generic version of Cenestin, used in treating postmenopausal women. The product has one patent, which expires in July 2015. The patent is listed to Duramed, Barr Pharmaceuticals' subsidiary.

Two days later, Watson confirmed that it was being sued by Pfizer and its Wyeth subsidiary in connection with Watson Laboratories' ANDA for sirolimus tablets. The product, a generic equivalent of Wyeth's Rapamune, is used in patients with renal organ transplants, and has a number of patents, the last of which expires in September 2018. Once again, Watson's ANDA contained a Paragraph IV certification, although this is only challenging the first of the patents, which expires in early 2014. Whether Watson is planning to challenge the other patents remains to be seen, but the firm noted that it believed it could be entitled to the 180-days marketing exclusivity for being the first to file.

Two days after that, on 30th April 2010, lawsuit numbers three and four were announced, with Watson confirming that its Watson Laboratories subsidiary had been sued by Abbott Laboratories and Fournier Laboratories after filing an ANDA for choline fenofibrate, a generic version of Trilipix, used in the treatment of high cholesterol. In this case, Watson is challenging the one patent listed in the FDA's Orange Book, which expires in January 2025.

On 5th May 2010 came two separate announcements of lawsuits. The first was filed by Eli Lilly, after Watson Laboratories filed an ANDA for raloxifene hydrochloride tablets, a generic version of Evista, an osteoporosis drug used in postmenopausal women. In this case, Watson is challenging three patents, which all expire in March 2017. These are not the only patents protecting the drug according to the Orange Book, but they are the last to expire; the other patents all expire in either July 2012 or March 2014. The second lawsuit to be announced on 5th May was the second in this batch to be filed by Abbott, this time in response to Watson Laboratories filing an ANDA for niacin extended release / simvastatin tablets. As with the other Abbott-related challenge, this is a product used in the treatment of high cholesterol. The product is protected by a number of patents, with expiration dates ranging between September 2013 and March 2018.

However, Watson's litigation news has not been all one way. On 7th May, Watson announced it had reached a settlement with Teva with regard to a second legal battle between the two, this time over an oral contraceptive. As with the other Teva battle, this revolved around a product which had originally been manufactured and marketed by Duramed. In this case, Watson has admitted that the patents being challenged are valid and enforceable, but in return has been granted a licence.

Of course, patent challenges are the bread and butter of generic firms, and whilst a sudden burst of lawsuits may appear to be bad news for Watson, the situation is also a sign that the firm's R&D has progressed well, enabling Watson to develop a number of new potential products for its pipeline. From the figures Watson has given, the products being challenged have a combined market value of nearly US$2.2 billion. As a generic competitor, Watson is only likely to see revenues worth much less than this, if all the challenges are successful, but nonetheless it will provide a good boost to the firm's fortunes. In the meantime unless settlements are reached out of court, the firm's lawyers will be busy in US District Courts in New Jersey, Delaware, Florida and Indiana.

Ian Platts – Editor, World Generic Markets