Dihydrocodeine is offered in Japan as tablets which incorporate 2.5 mg of dihydrocodeine phosphate and caffeine, the decongestant d,l-methylephedrine HCl, along with the antihistamine chlorpheniramine, and packets of granules which effervesce like Alka-Seltzer with ten mg of dihydrocodeine with lysozyme and chlorpheniramine, promoted for OTC sale as New Bron Answer-ACE. https://bettersleepuk.com/product/codeine-phosphate-30mg/