When a patient has a known and significant allergy, they may need an emergency medication like an epinephrine auto-injector (EpiPen). Epinephrine is a “rescue drug” because it opens up the airway and can raise blood pressure during a reaction. If you need one, you can get an EpiPen at an urgent care center. For a common and minor allergic reaction, an antihistamine like diphenhydramine (Benadryl) will likely help a lot. Antihistamines can be bought at your local pharmacy, but it may be better and quicker for you to go to urgent care for treatment. Urgent care can provide a quick assessment of an allergic reaction as well as immediate treatment on the spot!