(The Associated Press)  Valeant Pharmaceuticals lost $973 million in the third quarter, and lowered the top end of its 2013 earnings forecast as it continues to digest an $8.7 billion acquisition of Bausch + Lomb. The Canadian drugmaker said Thursday it recorded a $645 million impairment charge in the quarter tied to an epilepsy treatment, charges of $305 million against Bausch + Lomb, and $142.5 million to settle some litigation.

Overall, the drugmaker’s loss equated to $2.92 per share. Excluding one-time items, it earned $1.43 per share. Last year, the company earned $7.6 million, or two cents per share. Revenue swelled 74 percent to $1.54 billion, due mainly to the acquisition. Analysts surveyed by FactSet expected, on average, earnings of $1.40 per share on $1.68 billion in revenue.

Valeant now expects 2013 earnings of between $6.11 and $6.16 per share on $5.7 billion to $5.9 billion in revenue. That compares to its forecast in August for earnings of $6 to $6.20 per share on revenue of $5.8 billion to $6.2 billion. The stock was down 3.7 percent, or $4.06, to $105 in in pre-market trading about two hours before the market opened today. Shares have risen more than 82 percent so far this year in regular market trading.