S.I. 168/2021 states that ‘an applicable person shall not travel to an airport or port for the purpose of leaving the State without reasonable excuse. S.I. 168/2021 details reasonable excuses for travel to an airport or port for purpose of leaving the State. These include:
(e) attend a medical or dental appointment, or accompany, to such an appointment, any other person residing with the person, or a vulnerable person,
(f) seek essential medical, health or dental assistance for the person, for any other person residing with the person, or for a vulnerable person,
For additional details please see the following webpages: https://www.gov.ie/en/campaigns/75d92-covid-19-travel-advice/