The NYSE listed firm, whose brands also include A&W root beer and Bai fruit drinks, said its quarterly revenue was little changed from a year earlier at US$1.6bn, below consensus for US$1.7bn.
Dr Pepper reported a fourth-quarter profit of US$508mln, or US$2.81 a share, compared with US$165mln a year earlier, after including a US$297mln benefit related to the US changes.
The planned tie -up of Keurig Green Mountain and Dr Pepper will allow Keurig and its owner, the European investment firm JAB Holding Co., to add their coffees to Dr Pepper's distribution network.
Dr Pepper shareholders are set to receive a US$103.75 per share special cash dividend in the Keurig deal, which the companies expect to close in the second quarter.
In morning trading in New York, Dr Pepper shares were down 0.4% at US$115.48, having risen by 21% since the Keurig deal was announced on January 29.