Table 1.

Therapeutic chemical–disease pairs

Number of diseases	Number of chemicals	% Chemicals
1	13 972	39.27
2	6657	18.71
5	6605	18.56
10	3119	8.77
20	1980	5.56
30	804	2.26
40	513	1.44
50	300	0.84
60	245	0.69
70	196	0.55
80	151	0.42
90	111	0.31
100	104	0.29
110	93	0.26
120	58	0.16
130	54	0.15
140	58	0.16
150	44	0.12
160	44	0.12
170	33	0.09
180	29	0.08
190	24	0.07
200	26	0.07
210	30	0.08
220	27	0.08
230	32	0.09
240	16	0.04
250	15	0.04
300	51	0.14
>300	189	0.53
Total	35 580	100.00

Over 13 000 chemicals have been tested on only one disease whereas 189 chemicals(the most highly repurposed chemicals according to the definition used here) have been tested for >300 diseases each.