It has put out a call for items including cereal, pasta, sauces, toiletries, bread, milk, fresh produce and sanitary items, as its stocks are exhausted after the Christchurch earthquake.
Community development team leader Melanie McNatty said the usually full foodbank was being hit by displaced Christchurch families seeking help.
The service had supported about 100 Christchurch families in the past 10 days, on top of the usual 300 parcels it distributed.
The problem was exacerbated by people and businesses giving food and aid directly to Christchurch, not thinking about evacuees or those Dunedin residents who still needed help.
"People have been sending stuff to Christchurch, but the need in Dunedin is still great. It will eventually let up, but there are a lot of people who are not going back," she said.
Communications and fundraising director Lisa Wells said the service had also been stretched as staff were sent to Christchurch and worked extra shifts to cover the Christchurch "embassy" at the Railway Station.
Dunedin's three other foodbanks were faring better, with the Salvation Army, Dunedin Anglican Family Care and St Vincent de Paul saying their stocks were fine, thanks to generous donations from the community.
Food donations can be dropped directly at the foodbanks.
Presbyterian Support will collect furniture and other items; phone (03) 477-7115.
