| Betazole Action Pathway |  | Drug Action | ATP / Betazole / Potassium cation / Zinc / Acetylcholine |
| Bethanechol Action Pathway |  | Drug Action | Bethanechol / Calcium / Magnesium cation |
| Bethanechol Drug Metabolism |  | Metabolic | Bethanechol |
| Bethanidine Drug Metabolism |  | Metabolic | Bethanidine |
| Betrixaban Action Pathway |  | Drug Action | Calcium |
| Bevacizumab Action Pathway |  | Drug Action | Bevacizumab |
| Bevacizumab VEGF Inhibitor Action Pathway |  | Drug Action | Bevacizumab |
| Bevantolol Action Pathway |  | Drug Action | ATP / Bevantolol / Potassium cation / Calcium |
| Bevantolol Beta Blocker Cardiac Action Pathway |  | Drug Action | ATP / Bevantolol / Calcium |
| Bezafibrate Action Pathway (New) |  | Drug Action | Biotin / Magnesium cation / Bezafibrate |
| Bezitramide Opioid Agonist Action Pathway |  | Drug Action | ATP / Calcium / Magnesium cation / Bezitramide / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid / Sar9, Met (O2)11-Substance P |
| Bicalutamide Drug Metabolism |  | Metabolic | Bicalutamide |
| Bictegravir Action Pathway |  | Drug Action | Bictegravir |
| Bifonazole Action Pathway |  | Drug Action | Formic acid / Mesoheme / Ergosterol / Bifonazole |
| Bifonazole Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Bifonazole |
| Biguanide Drug Metabolism |  | Metabolic | Biguanide |
| Bilastine H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Calcium / Magnesium cation / Bilastine |
| Bilastine H1-Antihistamine Action |  | Drug Action | Calcium / Bilastine |
| Bilastine H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide / Bilastine |
| Bilastine H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Calcium / Bilastine |
| Bile Acid Biosynthesis |  | Metabolic | Glycine / NADH / ATP / Iron / Taurine / Mesoheme / Cholic Acid / Flavin adenine dinucleotide / Palmitic Acid / Pyrophosphoric acid / Taurocholic acid / Cholesterol / Chenodeoxycholic acid / Deoxycholic acid / Taurochenodeoxycholic acid |
| Bimatoprost Action Pathway |  | Drug Action | Bimatoprost / Calcium / Magnesium cation / Cyclic adenosine monophosphate |
| Binimetinib Drug Metabolism |  | Metabolic | Binimetinib |
| Biotin Metabolism |  | Metabolic | Biotin / Lysine / ATP / Pyrophosphoric acid |
| Biotinidase Deficiency |  | Disease | Biotin / Lysine / ATP / Pyrophosphoric acid |