Unlike most developed nations, as of this writing the United States has no comprehensive national health care system (there are programs for the elderly and the poor). Indeed, the mere proposal of it seems quite polarizing.
Visitors from other countries who need non-emergency medical attention are best served by going to free-standing medical clinics. The level of care is typically very good, but you’ll be paying out of pocket for the service, unfortunately.
For emergencies, however, do not hesitate to go to the closest hospital emergency room, where generally the level of care is also quite good, especially for trauma. Worry about payment later. Emergency rooms in the United States are required to take true emergency cases whether or not the patient can pay for services.
Call 911 for ambulance service.
Unlike many European nations, antibiotics are available in the United States only on a prescription basis and are not available over the counter. Most cold, flu, and allergy remedies are available over the counter. While homeopathic remedies are gaining popularity in the United States, they are nowhere near as prevalent as in Europe.
Drugs with the active ingredient ephedrine are available in the United States without a prescription, but their purchase is often tightly regulated to cut down on the use of these products to make the illegal drug methamphetamine.