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Hugh Pickens writes:

Andrew Pollack reports at the NYT that a federal judge has blocked an attempt by the drug company Actavis to halt sales of an older form of its Alzheimer’s disease drug Namenda in favor of a newer version with a longer patent life after New York’s attorney general filed an antitrust lawsuit accusing the drug company of forcing patients to switch to the newer version of the widely used medicine to hinder competition from generic manufacturers. “Today’s decision prevents Actavis from pursuing its scheme to block competition and maintain its high drug prices,” says Eric Schneiderman, the New York attorney general. “Our lawsuit against Actavis sends a clear message: Drug companies cannot illegally prioritize profits over patients.” The case involves a practice called product hopping where brand name manufacturers (“product hoppers”) make a slight alteration to their prescription drug (PDF) and engage in marketing efforts to shift consumers from the old version to the new to insulate the drug company from generic competition for several years. For its part Actavis argued that an injunction would be “unprecedented and extraordinary” and would cause the company “great financial harm, including unnecessary manufacturing and marketing costs.” Namenda has been a big seller. In the last fiscal year, the drug generated $1.5 billion in sales. The drug costs about $300 a month.