| direct-children | documentation | graph |
| BiologicallyActiveSubstance | 271 | A Substance that is capable of inducing a change in the structure or functioning of an Organism... | ^ |
| Antihistamine | 9 | Antihistamines are drugs which treat hay fever and other allergies. Typically, people take antihist... | ^ |
| Zyrtec | . | | ^ |
| Loratadine | 1 | Loratadine, sold under the brand name Claritin among others, is a medication used to treat allergie... | ^ |
| Cetirizine | 1 | Cetirizine, sold under the brand name Zyrtec among others, is a second-generation antihistamine use... | ^ |
| Fexofenadine | 1 | Fexofenadine, sold under the brand name Allegra among others, is an antihistamine pharmaceutical ... | ^ |
| Levocetirizine | 1 | Levocetirizine, sold under the brand name Xyzal among others, is a third generation antihistamine u... | ^ |
| Chlorpheniramine | . | | ^ |
