The man, not named in the brief report by Patong Police, was arrested near Yona Pier on Thaweewong Rd (the beach road) at about 10:45pm Tuesday night (Jan 21).
According to the authorities, the suspect was found in possession of the illicit drug without proper authorisation.
No further details were revealed about the arrest.
Patong Police noted they will continue to crack down on drug-related offenses in the area, especially in high-traffic tourist zones.
They also stressed their commitment to maintaining law and order in Phuket, a premier destination for international visitors.
Patong Police urged residents and tourists to report any suspicious activities to their hotline at 076-342769 as part of the campaign to ensure public safety.