Medicines have brand names and generic names. A medicine is sold only under its brand name when it's first made. It can later be made and sold as a generic. Generic medicines cost less than medicines with brand names. And most work just as well. Unless your doctor says otherwise, most people can use the generic medicine. A common mistake is to take a generic and a brand name of the same medicine. Some people do this. They think they're different. This can lead to harmful reactions. This is also a good reason to bring all your prescriptions in their original bottles to your health care visits.