Abdominal pain, nausea, fatigue and dizziness are among the reported side effects of the Pfizer-BioNTech vaccine.
The Health Products Regulatory Authority says up to last Monday, it has been notified of 81 mild to moderate suspected cases.
More than 77,000 doses of the vaccine have been administered.
Chief Executive of the HPRA, Dr. Lorraine Nolan, says no serious allergic reactions have been reported:
