Final answer:
The new asthma drug with a novel mechanism of action is likely to be sold as a schedule 3 drug in Australia during its initial stages of marketing, allowing for control of its use and monitoring of adverse effects.
Step-by-step explanation:
In the initial stages of its marketing, the new drug for asthma with a novel mechanism of action is MOST likely to be sold as a schedule 3 drug in Australia. This classification would allow for control of its use and monitoring of possible adverse effects. Schedule 3 drugs are available without a prescription but are kept behind the counter and may require consultation with the pharmacist. They are considered to have a moderate potential for abuse or misuse.