In case of an emergency, dial 110 or 112 for free from any phone booth to order a nice Krankenwagen (ambulance). Most doctors and dentists are unavailable in the evenings and on weekends. General practitioners (allgemeine und praktische Medizin) typically refer you to a specialist.
The hypochondriac Germans love a nice visit to Mr. Pharmacy, especially when Mrs. State is footing the bill. Even for flu remedies you have to visit a pharmacy (Apotheke). For late night emergencies call the pharmacy hotline at tel. 22 80 22, visit www.apo110.de or look on the door of any pharmacy in town to learn which is open for a 24-hour shift.