By Peter Loftus 

Most pharmaceutical-company investors would be thrilled at the prospect of a new drug reaching annual sales of $2 billion to $3 billion. But the hit AbbVie Inc. shares took Friday shows how high expectations have become for new hepatitis C drugs.

AbbVie Inc. Chief Executive Richard Gonzalez said Friday he expects the company's new hepatitis C treatment, Viekira Pak, to be selling at an annualized clip of more than $3 billion by the end of 2015. "We believe we have potential to capture a meaningful share" of the hepatitis C market, he said on a conference call with analysts.

But because Mr. Gonzalez characterized the $3 billion prediction as a year-end "exit rate"--not a full-year forecast--some analysts calculated that full-year 2015 sales would come in closer to $2 billion, reflecting a ramping up throughout the year.

A $2 billion drug in its first full year on the market would still be impressive by historical standards, but in the case of Viekira Pak it falls short of analysts' current consensus forecast of about $2.8 billion--and short of what investors have come to expect for new hepatitis C drugs. AbbVie shares were off 3.5% at $60.91 in recent trading. Earlier Friday the stock fell to $60.12.

The market for new hepatitis C treatments took off last year, as Gilead Sciences Inc. launched Sovaldi and then Harvoni, a pill that combines Sovaldi with another drug. Analysts estimate Gilead's combined sales for both drugs in 2014 were more than $12 billion; Sovaldi alone racked up more than $8.5 billion in sales for the first nine months of 2014, making it the fastest-selling drug launch in history. Gilead started facing competition when Viekira Pak hit the market in December.

The new drugs have higher cure rates, fewer side effects and shorter treatment durations than older drugs that were standard treatment just a few years ago. The segment has been particularly lucrative in the U.S. because the companies are charging high prices, and because there are at least 3.2 million Americans with chronic hepatitis C infection. Viekira Pak costs about $83,300 a patient for a 12-week treatment, while Harvoni costs about $94,500 for a 12-week treatment.

Some critics have called the price tags excessive. A Senate committee last year began an investigation of Gilead's pricing for Sovaldi, and a transit agency in Philadelphia recently filed a federal lawsuit against Gilead accusing the company of "price-gouging." IMS Health estimates global spending on hepatitis C drugs will reach about $26 billion in 2018.

Analysts and investors are now scrutinizing every twist and turn in what has rapidly become a huge market--but one with competitive and clinical dynamics that make it tough to predict how long drug companies can count on the eye-popping revenue.

"These are mind-boggling numbers," said Michael Yee, biotechnology analyst with RBC Capital Markets. But he said some investors already are concerned that the hepatitis C market will peak and then decline somewhat within the next few years, as the pool of patients needing treatment shrinks, and as other companies including Merck & Co. introduce new treatments, which is likely to fuel pricing pressure.

Some level of price competition has already begun, with AbbVie and Gilead offering insurers, pharmacy-benefit managers and state Medicaid programs undisclosed discounts in exchange for making their drugs the preferred option for patients on the health plans.

Analysts said some of the pressure on AbbVie's stock Friday reflected investor concern that AbbVie has been more aggressive in discounting than previously thought. Mr. Gonzalez said he didn't believe the discounts AbbVie has been offering were unusual, though he didn't quantify them.

On Friday, AbbVie said U.S. doctors wrote about 1,100 prescriptions for Viekira Pak from its December introduction through Jan. 16. AbbVie reported fourth-quarter sales of $48 million for the drug. Mr. Gonzalez said deals with health-care payers have made the drug available to about 40% of insured patients in the U.S., including some in which Viekira Pak is the exclusive option. European regulators approved AbbVie's drug for sale this month.

AbbVie reported a fourth-quarter loss of $810 million, or 51 cents a share, on costs associated with its scuttled plan to acquire Shire PLC for $54 billion last year. Excluding those costs and other items, AbbVie would have earned 89 cents a share on $5.45 billion in sales, more than analysts' expectations and up from earnings of 82 cents a share on sales of $5.1 billion in the year-earlier period. Sales of AbbVie's biggest drug, the anti-inflammatory treatment Humira, rose 11% to $3.36 billion in the quarter.

Write to Peter Loftus at peter.loftus@wsj.com

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