The Social Affairs Ministry has proposed that two plants and the psychotropic ingredients they contain be added to the country's controlled substances list.
Of the plants, one, salvia divinorum, related to culinary sage, has become a plant of concern in other countries. It contains potent, DMT-like hallucinogens.
The other plant, kratom (Mitragyna speciosa) is lesser-known, an evergreen member of the coffee family native to Southeast Asia.
Both plants also have medicinal and/or religious uses.
Countries that have placed salvia divinorum on controlled substances lists include EU members, six US states, Brazil, Chile, Canada and South Korea.
The ministry cited a need to keep abuse of new psychoactive substances from spreading.