Pharmacies are expected to begin administering COVID-19 vaccines from next week.
They'll initially administer the Johnson and Johnson (Janssen) vaccine to people over 50 who've yet to receive a jab.
Darragh O'Laughlan from the Irish Pharmacy Union says they'll administer other vaccines over time.
He explained: "Pharmacies will be in a position to administer the Janssen vaccine when that becomes available - that should be starting hopefully next week.
"As we progress down through the age cohorts, we will see pharmacies - particularly those located at a distance from vaccination centres - administering the mRNA vaccines... the Pfizer vaccines."
Most people in younger age groups are expected to receive either the Pfizer or Moderna vaccines, due to ongoing restrictions around the use of AstraZeneca and Janssen vaccines in younger age groups.
There are also expected to be supply issues around the Janssen one-dose vaccine over the coming weeks, with the Government expecting a 'significant' under-delivery in June.
More than half the adult population has now received a first dose of a COVID-19 vaccine.
Meanwhile, the registration portal for people aged 40 to 44 opens this week.
Those aged 44 will be able to register first from tomorrow, followed by those aged 43, 42 etc... over subsequent days.