What over the counter nonprescription drugs are sometimes used improperly to provide users with a high?

Some over-the-counter (OTC) drugs that are sometimes misused for recreational purposes include diphenhydramine, found in products like Benadryl, and dextromethorphan (DXM), commonly found in cough syrups. Diphenhydramine can cause hallucinations and sedation when taken in excessive amounts, while DXM can produce dissociative effects. Other OTC medications, such as pseudoephedrine, may also be misused in the production of illicit drugs. These substances can pose significant health risks when used improperly.