| Labetalol Action Pathway |  | Drug Action | ATP / Labetalol / Potassium cation / Calcium |
| Labetalol B1-Adrenergic Cardiac Muscle Relaxation Action Pathway |  | Drug Action | ATP / Labetalol / Calcium |
| Lacidipine Action Pathway |  | Drug Action | ATP / Calcium / Magnesium cation / Lacidipine |
| Lacosamide Action Pathway |  | Drug Action | Potassium cation / Calcium / Lacosamide |
| Lactic Acidemia |  | Disease | Pyridoxal phosphate / Pyruvic acid / Biotin / Adenosine phosphate / Glutamic acid / Glycine / Alanine / ATP / Zinc / Oxogluric acid / Pyrophosphoric acid / Glyoxylic acid |
| Lactic Acidemia |  | Disease | Pyridoxal phosphate / Pyruvic acid / Biotin / Adenosine phosphate / Glutamic acid / Glycine / Alanine / ATP / Zinc / Oxogluric acid / Pyrophosphoric acid / Glyoxylic acid |
| Lactose Degradation |  | Metabolic | ATP / Potassium cation / Lactose |
| Lactose Intolerance |  | Disease | ATP / Potassium cation / Lactose |
| Lactose Intolerance |  | Disease | ATP / Potassium cation / Lactose |
| Lactose Synthesis |  | Metabolic | ATP / Calcium / Magnesium cation / Iron / Zinc / Uridine diphosphate glucose / Alpha-D-Galactose-1-Phosphate / Uridine-5'-Diphosphate / Uridine monophosphate / Pyrophosphoric acid / Lactose |
| Lactulose Action Pathway |  | Drug Action | L-Glutamine / Glutamic acid / Lactulose / Magnesium cation |
| Lafutidine H2 Anti-Histamine Action Pathway |  | Drug Action | ATP / Potassium cation / Zinc / Acetylcholine / Lafutidine |
| Lamivudine Action Pathway |  | Drug Action | Lamivudine |
| Lamivudine Anti-viral Action Pathway |  | Drug Action | ATP / Lamivudine / Magnesium cation |
| Lamivudine Metabolism Pathway |  | Drug Metabolism | ATP / Lamivudine / Magnesium cation / Uridine-5'-Diphosphate / N,N,N-Trimethyl-2-(phosphonooxy)ethanaminium / Pyrophosphoric acid |
| Lamotrigine Action Pathway |  | Drug Action | Lamotrigine / Potassium cation / Calcium |
| Lansoprazole Action Pathway |  | Drug Action | Lansoprazole / Potassium cation / Zinc |
| Lansoprazole Action Pathway (old) |  | Drug Action | ATP / Lansoprazole / Potassium cation / Zinc / Acetylcholine |
| Lansoprazole Metabolism Pathway (old) |  | Drug Metabolism | Lansoprazole |
| Lanthanum carbonate Drug Metabolism |  | Metabolic | Lanthanum carbonate |
| Lapatinib Action Pathway |  | Drug Action | Lapatinib / Zinc |
| Lapatinib Predicted Metabolism Pathway |  | Metabolic | Lapatinib / Mesoheme |
| Larotrectinib Drug Metabolism |  | Metabolic | Larotrectinib |
| Latanoprost Action Pathway |  | Drug Action | ATP / Latanoprost / Potassium cation / Magnesium cation / Zinc / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Latanoprostene bunod Action Pathway |  | Drug Action | ATP / Potassium cation / Magnesium cation / Zinc / Cyclic adenosine monophosphate / Pyrophosphoric acid / Latanoprostene bunod |