Valeant Pharmaceuticals International also announced that activist investor and major Valeant shareholder Bill Ackman would join the board and expressed confidence that it would meet a key deadline for submitting its annual report to US securities regulators.
But the drugmaker opened a new public spat with former chief financial officer Howard Schiller, accusing him of "improper conduct." Schiller, fighting an effort to be ousted from the board, denied the accusations.
In midday trading, Valeant shares jumped 8.4 percent to $29.25 on the New York Stock Exchange. Shares had plunged more than 50 percent on March 15 after Valeant slashed its earnings forecast and warned of a possible debt default due to potentially missing a deadline to file its annual report.
Valeant faces numerous government probes over accusations it gouged customers over the price of its prescription drugs.
The company has also been under fire over its accounting, disclosing that it should not have included $58 million in revenue from the mail-order pharmacy Philidor in 2014 and that it would need to restate at least four quarters' worth of earnings and file its annual report for 2015 late.
Valeant said it had opened a search to replace Pearson, who will stay on until his replacement is appointed.
The company asked Schiller, who had served as interim chief executive while Pearson was on medical leave, to resign from the board.
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