| Record No. | Name | No. of Entries |
| 151 | Bicuculline methiodide | 1 |
| 152 | Bicuculline methobromide | 1 |
| 153 | Bicuculline methochloride | 1 |
| 154 | Bicuculline methoxide | 1 |
| 155 | Bisbenzyl hydrochloride | 1 |
| 156 | Bisnor-C-alkaloid H | 1 |
| 157 | Bisnordihydrotoxiferine | 2 |
| 158 | Bisoltus | 1 |
| 159 | Boldine | 45 |
| 160 | Boldine di-TMS derivative | 1 |
| 161 | Bracteoline | 2 |
| 162 | BRN 1516470 | 1 |
| 163 | BRN 1549182 | 1 |
| 164 | BRN 1549933 | 1 |
| 165 | BRN 1555207 | 1 |
| 166 | BRN 5233750 | 1 |
| 167 | BRN 5322099 | 1 |
| 168 | Bromanyl | 1 |
| 169 | Bromeine | 1 |
| 170 | Bromocodeine | 1 |
| 171 | Bulbocapnine | 20 |
| 172 | Bulbocapnine methiodide | 1 |
| 173 | BULBOCAPNINE,HYDROCHLORIDE | 1 |
| 174 | Buprenorphine | 8 |
| 175 | Buprenorphine-3-O-glucuronide | 1 |