How buyers firstly get to know about the pharma product of a particular company for import

Hello Everyone,
Good day to you.
please help me regarding below issue.

“how buyers firstly get to know about the pharma product of a particular company for import. In case registration for export, there is an agent who notices the product to buyers. If we go reversely, how buyer can notice the particular product of a p[articular company.”

Waiting for your valuable feedback.