| Palonosetron Serotonin antagonist Action Pathway |  | Drug Action | Pyridoxal phosphate / Tryptophan / Sapropterin / Palonosetron / Calcium / Iron / Oxitriptan |
| Pamidronate Action Pathway |  | Drug Action | Cholecalciferol / ATP / Pamidronic acid / Magnesium cation / Iron / Dimethylallyl Diphosphate / Formic acid / Geranyl Diphosphate / Mesoheme / Flavin adenine dinucleotide / Palmitic Acid / Pyrophosphoric acid / Cholesterol / ISOPENTENYL PYROPHOSPHATE / Farnesyl diphosphate |
| Pamidronate Action Pathway (new) |  | Drug Action | ATP / Pamidronic acid / Magnesium cation / Dimethylallyl Diphosphate / Geranyl Diphosphate / Pyrophosphoric acid / Cholesterol / ISOPENTENYL PYROPHOSPHATE / Farnesyl diphosphate |
| Pamidronate Drug Metabolism Pathway |  | Metabolic | Pamidronic acid |
| Pancreas Function |  | Physiological | ATP / Potassium cation / Calcium |
| Pancreas Function - Alpha Cell |  | Physiological | ATP / Potassium cation / Calcium |
| Pancreas Function - Beta Cell |  | Physiological | ATP / Potassium cation / Calcium / Magnesium cation / Cyclic adenosine monophosphate / Acetylcholine |
| Pancreas Function - Delta Cell |  | Physiological | ATP / Potassium cation / Calcium |
| Panitumumab Action Pathway |  | Drug Action | Panitumumab |
| PANoptosis |  | Signaling | Calcium / Mesoheme |
| Pantethine Drug Metabolism |  | Metabolic | Pantethine |
| Pantoprazole Action Pathway |  | Drug Action | Pantoprazole / Potassium cation / Zinc |
| Pantoprazole Action Pathway |  | Drug Action | ATP / Pantoprazole / Potassium cation / Zinc / Acetylcholine |
| Pantoprazole Metabolism Pathway |  | Drug Metabolism | Pantoprazole |
| Pantothenate and CoA Biosynthesis |  | Metabolic | Adenosine phosphate / Cysteine / ATP / Cysteamine / Calcium / Pantothenic acid / Cytidine-5'-Triphosphate / Flavin mononucleotide / Pyrophosphoric acid |
| Paramethadione Action Pathway |  | Drug Action | Pyridoxal phosphate / Glutamic acid / ATP / Paramethadione / Calcium / Magnesium cation / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid |
| Parecoxib Action Pathway |  | Drug Action | Glutathione / Valdecoxib / Dinoprostone / Calcium / Mesoheme / Prostaglandin G2 / Arachidonic Acid / Parecoxib |
| Parecoxib Drug Metabolism |  | Metabolic | Parecoxib |
| Pargyline Action Pathway |  | Drug Action | Pyridoxal phosphate / Ademetionine / Ascorbic acid / Tyrosine / NADH / Sapropterin / Norepinephrine / Dopamine / Levodopa / Magnesium cation / Iron / Pargyline / Flavin adenine dinucleotide / Pyrroloquinoline Quinone |
| Pargyline Amine Oxidase Serotonin Antidepressant Action Pathway |  | Drug Action | Pyridoxal phosphate / Tryptophan / Sapropterin / Calcium / Iron / Pargyline / Oxitriptan / Flavin adenine dinucleotide |
| Paritaprevir Action Pathway |  | Drug Action | Magnesium cation / Zinc / Paritaprevir |
| Parnaparin Action Pathway |  | Drug Action | Calcium |
| Paromomycin Action Pathway |  | Drug Action | Paromomycin |
| Paromomycin Action Pathway (New) |  | Drug Action | Paromomycin |
| Paromomycin Action Pathway (new) |  | Drug Action | Paromomycin |