AIDS group to sue Pfizer over Viagra ads Mon Jan 22, 2007 10:02 AM ET By Lisa Richwine WASHINGTON (Reuters) - A major U.S. AIDS treatment group plans to file a lawsuit on Monday that accuses drug giant Pfizer Inc. of illegally promoting recreational use of its blockbuster impotence pill Viagra. The AIDS Healthcare Foundation (AHF) told Reuters it wants Pfizer to be barred from marketing Viagra as a lifestyle or sexual enhancement drug. The nonprofit organization said Pfizer's actions had led to risky behavior by men and an increase in HIV and other sexually transmitted diseases. "Pfizer has created...