Healthcare Clinic at Walgreens is a retail clinic inside of Walgreens in Mckinney and is open today from 8:30am to 7:00pm. They are located at 4994 W University Dr and open 6 days per week. Of course it's always best to call in advance to confirm hours of operation before walking in.
Retail clinics offer a wide range of services overlapping considerably with those of a traditional walk-in urgent care center. That said, they are usually staffed by a Practitioner (NP) rather than a medical doctor and generally do not have an on-site x-ray or lab services, which will prevent them from seeing patients with more advanced injuries and illnesses.