Eli Lilly & Co. (LLY) reported a 27% decline in fourth-quarter profit, as sales of antipsychotic Zyprexa took a big hit from new generic competition.

The Indianapolis drug maker also disclosed Tuesday that two late-stage clinical trials of experimental Alzheimer's disease drug solanezumab will continue, following interim safety and futility analyses by an independent monitoring committee. The trials are expected to be completed in the second half of the year.

Lilly is bracing for a rough couple of years due to the decline in Zyprexa sales and the expected loss of exclusivity for some other drugs. The company is betting that continued sales growth for certain drugs, and the introduction of new ones, will help replace revenue lost to generic competition.

"We're seeing very good growth trajectories for many of our products," Chief Executive John Lechleiter said in an interview.

Solanezumab would be a big contributor to a Lilly rebound if it shows a positive risk-benefit profile in testing and clears regulatory review. But investor expectations for the drug are relatively low due to uncertainty that the drug's mechanism of action is the right approach to treating Alzheimer's, a form of dementia that gets worse over time.

Lechleiter cautioned that the hurdle for continuing the solanezumab trials was relatively low, and that investors shouldn't "over-interpret" the decision to continue them. The studies will have to be completed to determine whether the drug is safe and effective, he said.

For the fourth quarter, Lilly reported profit of $858.2 million, or 77 cents a share, down from $1.17 billion, or $1.05 a share, a year earlier. The latest quarter included a charge related to its recent withdrawal of sepsis drug Xigris from the market and other costs; excluding these, earnings would have been 87 cents a share, above the mean estimate of analysts surveyed by Thomson Reuters of 81 cents a share.

Fourth-quarter revenue dropped 2% to $6.05 billion, above the Thomson estimate, with favorable currency-exchange rates providing a 1% boost to sales.

Global sales of Zyprexa, which treats schizophrenia and other conditions and was previously Lilly's top-selling product, tumbled 44% to $750 million. The drug's U.S. patent protection expired in October. U.S. Zyprexa sales dropped 56%.

Several other Lilly drugs helped cushion the Zyprexa decline. Sales of antidepressant Cymbalta jumped 20% to $1.2 billion.

Diabetes drugs Humalog and Humulin also posted sales gains, as did cancer treatment Alimta.

Sales of erectile dysfunction pill Cialis rose 6%.

Lilly's animal-health unit, which has grown partly through acquisitions, posted a 10% sales gain, to $468 million.

Lilly reiterated the 2012 financial forecast it provided earlier this month, which reflected a steeper-than-expected decline in full-year Zyprexa sales.

Lilly said it might have to make material changes to its 2011 reported results as well as its 2012 financial forecast, because it may have to change how it accounts for the recent termination of its diabetes-drug partnership with Amylin Pharmaceuticals Inc. (AMLN). Lilly is consulting with the Securities and Exchange Commission on the Amylin accounting treatment.

Shares were up 3.18% at $40.50 in premarket trading. The stock has risen 5.6% over the past three months.

-By Peter Loftus, Dow Jones Newswires; +1-215-982-5581; peter.loftus@dowjones.com

--Melodie Warner contributed to this article.

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