NEW YORK (CNN/Money) - Bristol-Myers Squibb's chief financial officer left the company Tuesday as the drugmaker continues to work on restructuring management after poor financial performance.

Bristol-Myers (BMY: Research, Estimates) Chairman and CEO Peter R. Dolan said Harrison M. Bains, a vice president, will temporarily replace Fred Schiff, who is leaving voluntarily.

On April 4, Dolan announced a major management reshuffle as the company ratcheted down earnings guidance for the first quarter and shares of Bristol-Myers fell more than 17 percent.

"As I said previously, I am taking steps to strengthen our company's organizational structure as part of our plan to improve performance," Dolan said in a statement. "As part of this process, I had begun working on CFO succession."

The company also affirmed its guidance for the first quarter and for 2002, exclusive of special charges and non-recurring items. Analysts surveyed by First Call are currently looking for first-quarter earnings of 43 cents per share and 2002 earnings of $1.43 per share.