| DB00721 | Procaine | approved, investigational, vet_approved | unknown | inhibitor | Details |
| DB00182 | Amphetamine | approved, illicit, investigational | yes | inhibitor | Details |
| DB01168 | Procarbazine | approved, investigational | yes | inhibitor | Details |
| DB09130 | Copper | approved, investigational | unknown | cofactor | Details |
| DB01171 | Moclobemide | approved, investigational | unknown | antagonist | Details |
| DB09363 | Rauwolfia serpentina root | investigational | unknown | substrate | Details |
| DB00668 | Epinephrine | approved, vet_approved | unknown | substrate | Details |
| DB06698 | Betahistine | approved, investigational | unknown | substrate | Details |