| Gs Adrenergic Smooth Muscle Relaxation |  | Physiological | ATP / Potassium cation / Calcium / Magnesium cation / Cyclic adenosine monophosphate |
| Gs Histaminic Smooth Muscle Relaxation |  | Physiological | ATP / Potassium cation / Calcium / Magnesium cation / Cyclic adenosine monophosphate |
| Gs Serotonergic Smooth Muscle Contraction |  | Physiological | ATP / Potassium cation / Calcium / Magnesium cation / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| GSK-1004723 H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Calcium / Magnesium cation / GSK-1004723 |
| GSK-1004723 H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide / GSK-1004723 |
| GSK-1004723 H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Calcium / GSK-1004723 |
| Guaifenesin Predicted Metabolism Pathway |  | Metabolic | Guaifenesin / Mesoheme |
| Guanadrel Sulfate Drug Metabolism Pathway |  | Metabolic | Guanadrel |
| Guanethidine Drug Metabolism |  | Metabolic | Guanethidine |
| Guanidine Drug Metabolism |  | Metabolic | Guanidine |
| Guanidinoacetate Methyltransferase Deficiency (GAMT Deficiency) |  | Disease | Pyridoxal phosphate / Ademetionine / Arginine / Aspartic acid / Ornithine / Adenosine phosphate / Succinic acid / Glutamic acid / Glycine / Creatine / Citrulline / NADH / ATP / Proline / Sapropterin / Nitric Oxide / Mesoheme / Glycocyamine / 3,4-Dihydro-2h-Pyrrolium-5-Carboxylate / Oxogluric acid / N(5)-[(hydroxyamino)(imino)methyl]-L-ornithine / Flavin adenine dinucleotide / Flavin mononucleotide / Urea / Pyrophosphoric acid / Maleic acid / 4-Carboxy-4-Aminobutanal |
| Guanidinoacetate Methyltransferase Deficiency (GAMT Deficiency) |  | Disease | Pyridoxal phosphate / Ademetionine / Arginine / Aspartic acid / Ornithine / Adenosine phosphate / Succinic acid / Glutamic acid / Glycine / Creatine / Citrulline / NADH / ATP / Proline / Sapropterin / Nitric Oxide / Mesoheme / Glycocyamine / 3,4-Dihydro-2h-Pyrrolium-5-Carboxylate / Oxogluric acid / N(5)-[(hydroxyamino)(imino)methyl]-L-ornithine / Flavin adenine dinucleotide / Flavin mononucleotide / Urea / Pyrophosphoric acid / Maleic acid / 4-Carboxy-4-Aminobutanal |
| Guanoxan Drug Metabolism |  | Metabolic | Guanoxan |
| Halofantrine Action Pathway |  | Drug Action | ATP / Halofantrine / Mesoheme |
| Haloperidol Dopamine Antagonist Action Pathway |  | Drug Action | Pyridoxal phosphate / Tyrosine / Sapropterin / Haloperidol / Dopamine / Levodopa / Calcium / Iron |
| Haloperidol Metabolism Pathway |  | Metabolic | Haloperidol / Mesoheme / Flavin mononucleotide / Uridine-5'-Diphosphate |
| Haloperidol NMDA Antagonist Action Pathway |  | Drug Action | L-Glutamine / Glutamic acid / Haloperidol / Calcium |
| Halothane GABA(A) Anesthetic Action Pathway |  | Drug Action | Pyridoxal phosphate / Glutamic acid / ATP / Halothane / Calcium / Magnesium cation / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid |
| Halothane NMDA Antagonist Action Pathway |  | Drug Action | L-Glutamine / Glutamic acid / Halothane / Calcium |
| Hartnup Disorder |  | Disease | Cysteine / Potassium cation / Urea |
| Hawkinsinuria |  | Disease | Pyridoxal phosphate / Ademetionine / Ascorbic acid / Aspartic acid / Tyrosine / Glutamic acid / NADH / Sapropterin / Norepinephrine / Epinephrine / Dopamine / Levodopa / Calcium / Magnesium cation / Iron / Zinc / 2-(3,4-Dihydroxyphenyl)Acetic Acid / Acetoacetic acid / Methylamine / 1,2-Dihydroxybenzene / Oxogluric acid / Flavin adenine dinucleotide / Pyrroloquinoline Quinone / Maleic acid / 4-Hydroxyphenylpyruvic acid / Homogentisic acid |
| Hawkinsinuria |  | Disease | Pyridoxal phosphate / Ademetionine / Ascorbic acid / Aspartic acid / Tyrosine / Glutamic acid / NADH / Sapropterin / Norepinephrine / Epinephrine / Dopamine / Levodopa / Calcium / Magnesium cation / Iron / Zinc / 2-(3,4-Dihydroxyphenyl)Acetic Acid / Acetoacetic acid / Methylamine / 1,2-Dihydroxybenzene / Oxogluric acid / Flavin adenine dinucleotide / Pyrroloquinoline Quinone / Maleic acid / 4-Hydroxyphenylpyruvic acid / Homogentisic acid |
| Heparin |  | Physiological | Heparin / Calcium |
| Heparin Action Pathway |  | Drug Action | Heparin / Calcium |
| Heparin. |  | Drug Action | Phylloquinone / Heparin / Calcium |