Getting multiple values on the same topic

Is there any way to not get multiple values on the same topic?
I selected the category “drug name(generic)” and I get, as expected randomly generated drug names, but there are some items that have multiple of them, for example:
Antimonium crudum, Baptisia tinctoria, Chamomilla, Fagopyrum esculentum, Glonoinum, Hypothalamus, Natrum carbonicum, Natrum muriaticum, Podophyllinum, Populus candicans, Selenium metallicum, Thyroidinum
Is there any way to prevent this? I want to limit the ammount of products to a single one per row