Britvic's revenue in the third quarter was £360.1m, down 1.5% on last year.
It says revenues in Great Britain were up with Brazil delivering solid revenue growth.
Performance in France and Ireland "remained more challenging with a further softening since the half-year."
Simon Litherland, chief executive, said: "Overall we have delivered a solid performance against a more challenging backdrop in quarter three. We remain confident of achieving market expectations for the full year, underpinned by the strength of our brand portfolio, exciting commercial plans and a tight focus on cost control."