A drug can be listed by either its brand name or its generic name.
The brand name is what the company that makes it has labeled it and the generic name is its chemical name.
Some examples:
Tylenol (brand name).....Acetaminophen (generic or chemical name)
Motrin (brand name)......ibuprofen (generic or chemical name)
Prilosec (brand name)....Omeprazole (generic or chemical name)
Benadryl (brand name)...Diphenhydramine (generic or chemical name)
Another term is chemical compound.
The generic drug Atorvastatin goes by the brand name Lipitor.
Fentanyl is a generic drug.
Glauctabs, MZM and Neptazane are all names used for methazolamide.
drug antagonism.
The FDA approved Aripcept (Donepezil) for generic sale in 2009.
No it appears that Extenze is a generic drug. Therefore there is no generic for it.
Medicine could be another way to mean drug.
No. Unasyn is the trade name for the combination of two generic drugs: ampicillin (a beta-lactam) and sulbactam (a beta-lactamase inhibitor). Ceftriaxone is a generic drug in another class of antibiotics altogether (cephalosporins).
Microgestin is a generic for the drug Loestrin.
Yes, azithromycin is generic for Zithromax.
If you meant "What is a drug name used by several companies?" then the answer would be a generic drug. An example of a generic drug would be aspirin.