| Bamipine H1-Antihistamine Action |  | Drug Action | Calcium |
| Bamlanivimab Action Pathway |  | Drug Action | Magnesium cation / Zinc / Bamlanivimab |
| Baricitinib Drug Metabolism |  | Metabolic | Baricitinib |
| Beclomethasone dipropionate Action Pathway |  | Drug Action | Glutathione / Beclomethasone dipropionate / Dinoprostone / Calcium / Prostaglandin D2 / Mesoheme / Prostaglandin G2 / Arachidonic Acid / Beclomethasone 17-monopropionate |
| Bedaquiline Drug Metabolism |  | Metabolic | Bedaquiline |
| Belumosudil Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Belumosudil |
| Bemiparin Action Pathway |  | Drug Action | Calcium |
| Benazepril ACE inhibitor Action Pathway |  | Drug Action | Glutamic acid / Benazepril / Zinc |
| Benazepril Action Pathway |  | Drug Action | Benazepril / Potassium cation / Zinc |
| Benazepril Metabolism Pathway |  | Drug Metabolism | Benazepril / Zinc |
| Bendamustine Action Pathway |  | Drug Action | Adenine / Bendamustine |
| Bendazac Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Bendazac |
| Bendroflumethiazide Action Pathway |  | Drug Action | Cysteine / Bendroflumethiazide / Potassium cation / Urea |
| Bendroflumethiazide Action Pathway (New) |  | Drug Action | Bendroflumethiazide / Potassium cation / Calcium |
| Bendroflumethiazide Drug Metabolism |  | Metabolic | Bendroflumethiazide |
| Benfotiamine Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Benfotiamine |
| Benzatropine Dopamine Reuptake Inhibitor Action Pathway |  | Drug Action | Pyridoxal phosphate / Tyrosine / ATP / Benzatropine / Dopamine / Levodopa / Calcium / Magnesium cation / Iron / Cyclic adenosine monophosphate |
| Benzethonium Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Benzethonium |
| Benzhydrocodone Opioid Agonist Action Pathway |  | Drug Action | ATP / Hydrocodone / Calcium / Magnesium cation / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Mesoheme / Pyrophosphoric acid / Sar9, Met (O2)11-Substance P / Benzhydrocodone |
| Benznidazole Drug Metabolism |  | Metabolic | Benznidazole |
| Benzocaine Action Pathway |  | Drug Action | ATP / Norepinephrine / Dopamine / Benzocaine / Potassium cation / Calcium |
| Benzphetamine Dopamine Reuptake Inhibitor Action Pathway |  | Drug Action | Pyridoxal phosphate / Tyrosine / ATP / Benzphetamine / Dopamine / Levodopa / Calcium / Magnesium cation / Iron / Cyclic adenosine monophosphate |
| Benzquinamide H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Benzquinamide / Calcium / Magnesium cation |
| Benzquinamide H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Benzquinamide / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Benzquinamide H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Doxylamine / Calcium |