* Internet health company Drkoop.com Inc. said its third-quarter net loss widened to $57.9 million, or $1.60 per share, including various expenses and items, compared with $20.6 million, or 68 cents, a year ago. Operating losses rose to $23.1 million from $21.1 million. Revenue fell 30% to $2 million. The loss in the 1999 quarter was $20.6 million, or 68 cents a share. During the quarter, the Austin, Texas-based company cut more than 30% of its work force and installed a new management team.