Dr Pepper Snapple Group Inc.'s (DPS) second-quarter earnings fell 13% as packaged beverage sales continued to weaken.

The beverage company also lowered its full-year sales estimate to 2% growth from its February forecast of a 3% increase and backed its core earnings guidance.

The company, whose brands include 7Up, Hawaiian Punch and Mott's apple juice, has seen its sales pressured by declining demand for soft drinks in the U.S. Dr Pepper Snapple, which gets the bulk of its sales from the U.S. soft-drink market, is trying to overcome the decline in full-calorie sodas by spending at least $30 million this year to launch five more mid-calorie drinks, following the introduction of Dr Pepper Ten last year.

Dr Pepper Snapple reported a profit of $155 million, or 76 cents a share, down from $178 million, or 83 cents, a year earlier. Excluding items such as unrealized commodity mark-to-market losses and separation costs, core earnings fell to 84 cents a share from 85 cents. Sales declined 0.6% to $1.61 billion.

Analysts polled by Thomson Reuters had most recently forecast per-share earnings of 84 cents on revenue of $1.64 billion.

Gross margin edged up to 58% from 57.7%.

Shipments, as measured by sales volume, declined 4%. Total bottler-case-sales volume, which reflects beverages sold by the company and its bottling partners, was down 3%.

Sales of packaged beverages, Dr Pepper Snapple's biggest segment by revenue, decreased 2.5% to $1.15 billion. Beverage-concentrates sales rose 1.5% to $336 million, while Latin America beverages sales climbed 12% to $127 million.

Shares closed Tuesday at $47.68 and were inactive premarket. The stock is up 7.9% so far this year.

Write to Melodie Warner at melodie.warner@dowjones.com

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