| Pergolide Mechanism of Action Action Pathway |  | Drug Action | Pyridoxal phosphate / Tyrosine / ATP / Dopamine / Pergolide / Levodopa / Calcium / Magnesium cation / Iron / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Perindopril ACE Inhibitor Action Pathway |  | Drug Action | Glutamic acid / Perindopril / Zinc |
| Perindopril Action Pathway |  | Drug Action | Perindopril / Potassium cation / Zinc |
| Perphenazine Mechanism of Action Action Pathway |  | Drug Action | Pyridoxal phosphate / Tyrosine / Sapropterin / Perphenazine / Dopamine / Levodopa / Calcium / Iron |
| Pexidartinib Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Pexidartinib |
| Phenacemide Predicted Metabolism Pathway |  | Metabolic | Phenacemide / Mesoheme |
| Phenbenzamine H1-Antihistamine Action |  | Drug Action | Calcium |
| Phenelzine Amine Oxidase Norepinephrine Antidepressant Action Pathway |  | Drug Action | Pyridoxal phosphate / Ademetionine / Ascorbic acid / Tyrosine / NADH / Sapropterin / Norepinephrine / Phenelzine / Dopamine / Levodopa / Magnesium cation / Iron / Flavin adenine dinucleotide / Pyrroloquinoline Quinone |
| Phenelzine Amine Oxidase Serotonin Antidepressant Action Pathway |  | Drug Action | Pyridoxal phosphate / Tryptophan / Sapropterin / Phenelzine / Calcium / Iron / Oxitriptan / Flavin adenine dinucleotide |
| Phenformin Drug Metabolism |  | Metabolic | Phenformin |
| Phenindamine Drug Metabolism |  | Metabolic | Phenindamine |
| Phenindamine H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Calcium / Magnesium cation / Phenindamine |
| Phenindamine H1-Antihistamine Action |  | Drug Action | Calcium / Phenindamine |
| Phenindamine H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Calcium / Magnesium cation / Phenindamine / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Phenindamine H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Calcium / Phenindamine |
| Phenindione Action Pathway |  | Drug Action | Phenindione / Phylloquinone / Calcium |
| Phenindione Drug Metabolism |  | Metabolic | Phenindione |
| Pheniramine H1 Antihistamine Neurological Sleep Action Pathway |  | Drug Action | Pyridoxal phosphate / Histidine / Calcium / Pheniramine |
| Pheniramine H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Calcium / Magnesium cation / Pheniramine |
| Pheniramine H1-Antihistamine Action |  | Drug Action | Calcium / Pheniramine |
| Pheniramine H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Calcium / Magnesium cation / Pheniramine / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Pheniramine H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Calcium / Pheniramine |
| Pheniramine Predicted Metabolism Pathway |  | Metabolic | Pheniramine / Mesoheme |
| Phenmetrazine Drug Metabolism |  | Metabolic | Phenmetrazine |
| Phenobarbital Action Pathway |  | Drug Action | Pyridoxal phosphate / Glutamic acid / ATP / Phenobarbital / Calcium / Magnesium cation / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid |