Desloratadine medicinal drug tablets known as Clarinex is a complex formulation comprising desloratadine, excipients, and a coating. It is a famous antihistamine used only for adult patients. It is dangerous to be left in the environment after its expiration as it is harmful to children. So, the present work introduces the idea of using Desloratadine tablets in expired form as green corrosion inhibitors for steel in 1.0 N HCl. Five analytical techniques were used to evaluate the inhibition

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... rmance of expired Desloratadine drug, namely gravimetric, atomic absorption spectroscopy (AAS), thermometric, gasometric, and acidimetric techniques. The effect of expired drug concentration, reaction temperature, and pH was studied. Corrosion inhibition was found to increase with an increase in concentration and to decrease with rising temperature and a decrease in pH. The techniques used are in good agreement with each other (±2%) indicating that it is possible to use the expired Desloratadine drug as a potential nontoxic green corrosion inhibitor for steel in industrial field at low pH values.