Three prominent senators are demanding that drugmaker Pfizer Inc. produce documents about its deals with insurers to get them to cover its cholesterol blockbuster Lipitor, rather than two generic versions just hitting drugstores.

Lipitor, the top-selling drug ever with nearly $11 billion in sales last year, got U.S. generic competition on Wednesday.

In an effort to retain as much of that revenue as possible for a while, Pfizer has offered big rebates to insurance plans and companies that process prescriptions — if they require pharmacies to dispense brand-name Lipitor rather than generic copies for the next six months. Pfizer also is offering patients remaining on Lipitor discounts so that their copayment would be equal to or lower than what they pay for generics under their health plan.

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