Lilly ICOS LLC said it intends to "vigorously defend itself" against a claim by Pfizer Inc. that its erectile dysfunction candidate, Cialis, infringes on Pfizer's patent that protects the blockbuster drug, Viagra. (BioWorld Today)

Lilly ICOS LLC said it intends to "vigorously defend itself" against a claim by Pfizer Inc. that its erectile dysfunction candidate, Cialis, infringes on Pfizer's patent that protects the blockbuster drug, Viagra. (BioWorld Today)