What adjuvant's presence in a drug product requires a special label warning?

The presence of tartrazine in a drug product requires a special label warning because it is known to cause allergic reactions in some individuals, particularly those who are sensitive to aspirin or have asthma. Tartrazine is a synthetic lemon yellow dye that is commonly used as a food and drug coloring agent. Due to the potential risk of hypersensitivity reactions, regulatory authorities mandate that products containing this ingredient bear specific warnings to inform consumers about the possibility of allergic responses. This labeling helps ensure that individuals who might be adversely affected can make informed choices about their use of the product.

On the other hand, glycerin, propylene glycol, and sucralose do not carry the same level of risk for allergic reactions requiring specific warnings, which is why they do not necessitate such labeling.