A Castlerea doctor says those over 50 should contact their GP for a booster vaccine.
While a third dose is currently being rolled out to those over 60, Dr. Madeline Ni Dhalaigh says some GP's have begun vaccinating those in the cohort below.
The rollout of booster vaccines to people with underlying conditions begins this week.
Over 666,000 people have been given a booster jab to date.
Speaking to Shannonside Northern Sound Dr. Ni Dhalaigh is encouraging those in the 50-59 age bracket to contact their local practice.