* Zonagen Inc. filed an application with the Food and Drug Administration for clearance to sell what would be the first challenger to Pfizer Inc.'s record-selling Viagra impotence pill. The pill, Vasomax, would be Zonagen's first drug on the market.
* Zonagen Inc. filed an application with the Food and Drug Administration for clearance to sell what would be the first challenger to Pfizer Inc.'s record-selling Viagra impotence pill. The pill, Vasomax, would be Zonagen's first drug on the market.