Releasing its half-year results to 30 June, Cadbury said that the costs related to product returns, advertising costs and manufacturing improvements.
It also admitted that the recall of seven products due to the possible presence of salmonella had also hit sales.
In the last four weeks its share of the confectionery market was 1.1% lower than last year, it said.
This week The Grocer revealed that supermarkets were reporting a 25% decrease in the sale of Cadbury products.
Cadbury also reported a 20% increase in first-half profit to £402m, on sales up 15% at £3.42bn.
Todd Stitzer, chief executive officer of Cadbury, said: “We expect to deliver underlying revenue growth towards the upper end of our goal range for the full year, but are still monitoring the trading impact of the UK recall.”
Meanwhile, the Food Standards Agency has said that from today five of the seven recalled products would be back on sale.