| Biotinidase Deficiency |  | Disease | Biotin / Lysine / ATP / Pyrophosphoric acid |
| Bismuth subcitrate potassium Drug Metabolism |  | Metabolic | Bismuth subcitrate potassium |
| Bismuth subgallate Drug Metabolism |  | Metabolic | Bismuth subgallate |
| Bisoprolol Action Pathway |  | Drug Action | ATP / Bisoprolol / Potassium cation / Calcium |
| Bisoprolol Action Pathway (New) |  | Drug Action | ATP / Bisoprolol / Calcium |
| Bisphenol A diglycidyl ether Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Bisphenol A diglycidyl ether |
| Bithionol Drug Metabolism |  | Metabolic | Bithionol |
| Bivalirudin Action Pathway |  | Drug Action | Bivalirudin / Calcium |
| Bivalirudin. |  | Drug Action | Bivalirudin / Phylloquinone / Calcium |
| Bloch Pathway (Cholesterol Biosynthesis) |  | Metabolic | Iron / Formic acid / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide / Cholesterol |
| Blue Diaper Syndrome |  | Disease | Cysteine / Potassium cation / Urea |
| Boceprevir Action Pathway |  | Drug Action | Magnesium cation / Zinc / Boceprevir |
| Boceprevir Drug Metabolism |  | Metabolic | Boceprevir |
| Bopindolol Action Pathway |  | Drug Action | ATP / Potassium cation / Calcium / Bopindolol |
| Bopindolol Action Pathway (New) |  | Drug Action | ATP / Pindolol / Calcium / Mesoheme / Bopindolol |
| Boscalid Drug Metabolism |  | Metabolic | Boscalid |
| Bosutinib Inhibition of BCR-ABL Action Pathway |  | Drug Action | Bosutinib |
| Bovine Thrombin Action Pathway |  | Drug Action | Calcium / Thrombin |
| Bretylium Drug Metabolism |  | Metabolic | Bretylium |
| Brexanolone Action Pathway |  | Drug Action | Pyridoxal phosphate / Glutamic acid / ATP / Progesterone / Calcium / Magnesium cation / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid / Brexanolone |
| Brexpiprazole Dopamine Agonist Action Pathway |  | Drug Action | Pyridoxal phosphate / Tyrosine / Sapropterin / Dopamine / Levodopa / Aripiprazole / Calcium / Iron / Brexpiprazole |
| Brexpiprazole Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Brexpiprazole |
| Brexpiprazole Serotonin Action Action Pathway |  | Drug Action | Pyridoxal phosphate / Tryptophan / Sapropterin / Calcium / Iron / Oxitriptan / Brexpiprazole |
| Brilliant blue G Drug Metabolism |  | Metabolic | Brilliant blue G |
| Brincidofovir Action Pathway |  | Drug Action | Cidofovir / Potassium cation / Magnesium cation / Pyrophosphoric acid / Brincidofovir |