codeine

This substance is a controlled medication due to its potential for dependence and misuse. It is typically encountered in medical contexts as a cough suppressant or a mild analgesic, often combined with other drugs like paracetamol or guaifenesin in over-the-counter or prescription syrups. As a chemical compound and medication, it is treated as an uncountable noun. It does not have a plural form in standard medical or conversational usage; one would refer to a dose or a quantity of codeine rather than multiple codeines.