The marketer had used actress/model Lauren Hutton and singer Patti LaBelle in campaigns.
A Wyeth spokeswoman said the company is following "standard practice" and is "reviewing its communications as it would when any new information comes out."
She said she was not sure whether ads were pulled out of circulation or whether ads were on hiatus.
"We're evaluating the situation," said another Wyeth spokesman, who said the company does not comment on ad and marketing plans.
Bates Healthworld, New York, handles Prempro.