UPDATE 2-Valeant's Pearson says timing of return uncertain
* Unexpected complications resulted in longer hospital stay-Pearson
* Shares up 0.6 pct at $89.10 in premarket (Adds details, shares)
Jan 25 (Reuters) - Valeant Pharmaceuticals International Inc's ailing chief executive, Michael Pearson, said he was on the road to recovery but was uncertain about when he would return from medical leave.
Pearson, who joined Valeant as CEO in 2010 after a 23-year career at consultancy McKinsey & Co, was hospitalized with severe pneumonia in late December.
"As you know, I unexpectedly entered the hospital in late December to receive treatment for severe pneumonia and some unexpected complications resulted in a longer hospital stay than anticipated," Pearson said in a memo to employees on Monday.
"...I look forward to being back at work when able," he said.
Pearson's illness capped a tumultuous year for Valeant as investors turn up the pressure for the Canadian drugmaker to provide a more detailed plan on how it will increase profits in 2016.
Valeant has faced concerns and criticism over steep price increases on some drugs and close ties to a specialty pharmacy that used aggressive methods to overcome insurer barriers to reimbursing its medicines.
The Laval, Quebec-based company has since cut ties with the pharmacy and reached a deal to distribute its drugs through leading pharmacy chain Walgreens Boots Alliance Inc. Continued...