| In the 1930s antibiotics emerged: first sulfa drugs, then penicillin and other antibiotics | 3 For the central nervous system o 2 |
|---|---|
| 2 For the cardiovascular system o 2 | Other drugs included antitoxins, a few biological vaccines, and a few synthetic drugs |
| [9]:23-24 As of 2008, thousands of approved drugs have been developed | 14 For infections and infestations o 2 |
|---|---|
| It could not distinguish between drugs released by manufacturers as opposed to the pharmaceutical industry | 19 For diagnostics o 2 |
based firms developed 29 of the 75 top-selling drugs; firms from the second-largest market, Japan, developed eight, and the United Kingdom contributed 10.
18