Dublin Simon has warned of a €1m shortfall in funding as it faces what it calls a "daunting" challenge dealing with the needs of increasing numbers of homeless people.
The charity says that government funding for homeless health services has plummeted by 54% per person over the past six years.
CEO Sam McGuinness said: "Health spending in homeless services stagnated while homeless numbers accelerated. It is not even close to meeting the needs of the sector."
The charity, which provides detox and healthcare, as well as outreach services and emergency accommodation, said it saved more than 1,000 people from homelessness last year.
But its annual report stated that of the 1,231 people that access its emergency accommodation services, 53% were in need of mental health support and 90% of these had additional physical or addiction issues.
The review found that Dublin Simon's Sure Steps counselling out-of-hours service made an average of two crisis interventions a day last year and the waiting time for non-crisis daytime service increased by 240%.
There was also an 85% increase in waiting time for the charity's detox facility on Usher's Island.
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Mr McGuinness said homelessness is expected to increase as a result of Covid-19 and that there is a danger of a health crisis because of underfunding.
Majella Darcy, Head of Treatment Services, said the Covid-19 pandemic had changed its services with counselling now done online and the introduction of a new Emotional Support Freephone Service.
The charity's plan to build a new €30m detox centre on Usher's Island has been delayed by the pandemic but construction is due to start in the New Year.
