Generic medicine names should be entirely in lowercase; a capital letter is only required for proprietary names. Always double-check medicine names for spelling. Unless the name is derived from a given name or another proper noun, disease names do not require an initial capital letter. Drugs are designated by their chemical ingredients. Each drug has two parts: a generic name and a brand name. The generic name is what people say when they talk about the drug without naming it for a particular company. The brand name is the name of the company that makes the drug. Drugs can have both a generic name and a brand name. For example, Lipitor is a drug made by Pfizer that is used to treat high blood cholesterol. Its generic name is simvastatin and its brand name is Lipitor. There are many other drugs that are also called Lipitor because they work by blocking an enzyme called HMG-CoA reductase. This enzyme is responsible for making more of this substance known as cholesterol, which is found in all cells of the body except red blood cells. When there are too much proteins on the surface of these cells, they become prone to damage and may trigger cancerous changes. Therefore, reducing cholesterol levels in the blood helps prevent heart disease and other problems related to aging. There are several ways that drugs can be named.