Final answer:
The maximum allowable limit for codeine to be classified as a Schedule V drug varies by country.
Step-by-step explanation:
The maximum allowable limit for codeine to be classified as a Schedule V drug varies by country. In the United States, for example, codeine is classified as a Schedule II drug when combined with other medications, such as acetaminophen or ibuprofen, but it is available over-the-counter in some other countries. It is important to consult the specific regulations of the country in question for the most accurate information regarding codeine's classification.