Newlands Cross Medical Centre, Aldi Shopping Complex Clondalkin 22 Dublin Tel. (01)4643386 newlandsmedicalcentre@eircom.net No appointments necessary and open 7 days a week as far as i can seeThey have a website too- but i can't remember the address
Dr. Micheal Lim in Newlands Medical Centre is excellent. Though the website says no appointment is neccessary, I would advise you to book one as it can get quite busy there.