AstraZeneca Pharmaceuticals (which does business as AstraZeneca US) can help with a full alphabet of ailments. The company, a subsidiary of global drugmaker AstraZeneca, is one of the largest pharma companies in the US. Its sales represent about 5% of all the drugs sold in the US and about 40% of its parent company's revenues. AstraZeneca US' treatments focus on several therapeutic areas: cardiovascular and metabolic, gastrointestinal, neuroscience, oncology, respiratory, and infection. Its best-known products include Crestor (high cholesterol), Seroquel (anti-psychotic), Nexium (acid reflux), Symbicort (asthma), and Zoladex (cancer treatment).