What action must dispensers take regarding illegitimate products?

Dispensers are required to identify and remove illegitimate products to prevent any potential harm to patients and ensure the safety and integrity of the medication supply chain. This action is crucial for public health as it helps mitigate risks associated with counterfeit drugs or products that do not meet the necessary safety or efficacy standards. By promptly removing such items from their inventory, dispensers can help protect consumers from the dangers associated with these products.

The other options, while they may seem more practical in terms of managing inventory or financial considerations, do not address the core responsibility dispensers have regarding patient safety and compliance with regulatory standards. Selling illegitimate products at a discount, hiding them, or donating them to charity would all pose significant risks and legal issues, contrary to the ethical obligations and regulations dispensers must follow.