Pfizer, Microsoft sue over illegal Viagra

Pfizer Inc. and Microsoft Corp. said Thursday they filed parallel lawsuits against Web site operators and spam advertisers that they say sell illegal cheap versions of Pfizer’s erectile dysfunction drug Viagra.

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The companies said the lawsuits follow a seven-month investigation to discover the identity of two Web site operators together with those advertising them via spam e-mails.

Pfizer has filed suit against CanadianPharmacy and E-Pharmacy Direct, while Microsoft has filed civil actions against the spam advertisers for the Web sites. Microsoft has also filed three suits against spam advertisers who advertise on other online pharmacies.