There are also controlled medications in Singapore. These are drugs that contain psychotropic or addictive components and not anyone can dispense it. Find out if your medication is controlled with the Health Science Authority. If you are looking for the list of import restrictions, you can read more about them here.
For controlled drugs, psychotropic substances, and restricted substances, you will need to apply for a license in order to bring them into Singapore.
Here are the specific guides for the 3 types of controlled medications in Singapore: