True North Communications' TN Media handles national broadcast buying; the remainder of the work is handled in-house.
Several shops have received requests for proposals. Zenith Media, New York, is the media buying and planning agency of record for Schering's prescription drugs, including top-selling anti-allergins Claritin and Nasonex. Zenith was awarded the $200 million account without a review in March.
The review is being conducted by Alvin Achenbaum & Partners, Dallas.
A spokeman at Schering's health-care products division did not return calls by press time. -- Richard Linnett
Copyright May 2001, Crain Communications Inc.