By Ben Hirschler
LONDON (Reuters) - ASTRAZENECA (AZN.LO)
AstraZeneca, which is seeking external deals to ensure growth, will also pay another $100 million after Actavis agreed to a number of changes to ongoing collaborations between the two firms.
Britain's second-biggest drugmaker posted fourth-quarter results that fell short of expectations and said 2015 sales revenue would decline by a mid single-digit percent at constant exchange rates.
Adjusted or "core" earnings per share, however, are forecast to increase by a low single-digit percent this year.
The shares slid 2.5 percent by 0845 GMT.
Citi analyst Andrew Baum said AstraZeneca appeared to have "kitchen-sinked" the quarter, or taken a deliberate hit to earnings by increasing drug development costs sharply in the period.
The British group, which saw off a $118 billion bid by Pfizer
Industry analysts had on average forecast sales in the quarter of $6.79 billion and earnings of 82 cents a share, according to Thomson Reuters.
Buying the Actavis respiratory drugs builds on AstraZeneca's acquisition of Almirall's
Respiratory is a key therapeutic area for AstraZeneca, whose Chief Executive Pascal Soriot has predicted a 75 percent jump in annual sales to $45 billion by 2023.
"We are on track to return to growth by 2017 and are well positioned to deliver our long-term goals,? Soriot said.
AstraZeneca has won over many investors with its line-up of new cancer drugs but it faces near-term pressure on profits from cheap generic copies of older drugs, with the arrival of copies of heartburn and ulcer medicine Nexium in the United States a big challenge in 2015.
Although sales are set to slide more this year, shareholders may take some heart from AstraZeneca's forecast that core earnings will increase from the $4.28 reported for 2014.
Soriot and his team have good reason to ensure earnings do not slip, since management incentives only vest fully if EPS remains at or above $4.20.
(Reporting by Ben Hirschler; Editing by David Holmes and Jane Merriman)