Pfizer Inc. said Thursday it will give away more than 70 of its most widely prescribed drugs, including Lipitor and Viagra, for up to a year to people who have lost jobs since Jan. 1 and have been taking the drug for three months or more. The announcement comes as the unemployment rate topped 8.9 percent in April.

Pfizer stands to benefit, too _ by keeping its customers, and with a tax write-off that will cover much of the cost of the donations. The move also buys the world’s largest drugmaker some good will as Washington looks to overhaul the health care system.

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