Police also arrested a 43-year-old woman during the operation.
Acting on a tip-off, police stopped a car driven by the suspect at Taman Danau Kota here at 5.37pm on Monday (May 17).
Kuala Lumpur Narcotics Crime Investigation Department (NCID) chief Asst Comm Adnan Azizon said the woman also led police to a condominium in Taman Ibukota Setapak on the same day.
"We seized 10kg of methamphetamine and 145g of heroin following checks on the car and the condominium.
"The drugs are worth RM396,466 and could have been supplied to 11,116 addicts," he said when contacted on Wednesday (May 19).
Two vehicles, five gold rings, three gold bracelets, two gold necklaces, a gold watch and RM5,478 cash were also seized, he added.