Rick B. Honey, a Pfizer spokesman, said the company believes the amount set aside "is adequate."

A Pfizer spokesman said it was too early to say how many people would join that new program, which has been operating for only two weeks.

According to a Pfizer spokesman, men who called the number frequently had to be reminded that the drug would not work without sexual stimulation.

Mr. Fitzgerald, the Pfizer spokesman, declined to comment on the investigation.

He died of cancer, a Pfizer spokesman said.

"Shareholders had asked about the information," said Bryant Haskins, a Pfizer spokesman.

"It's the right population to reach with a health message," said Geoff Cook, a Pfizer spokesman, delicately.

A Pfizer spokesman declined to estimate the legal costs.

Daniel Watts, a Pfizer spokesman, said that the company did not want to penalize patients who needed stronger doses.

"This is a rapidly moving picture," said the Pfizer spokesman, Stephen Lederer.