Prince Abdel Mohsen Bin Walid Bin Abdulaziz and four of his friends were detained by airport security on Monday, while trying to smuggle about two tons of Captagon pills and some cocaine.
The four other men are also Saudi citizens, identified as Bandar Bin Saleh al-Shirali, Yaahia Bin Shaim Bin Shumari, Ziyad Bin Samir al-Hakim and Mubarak Bin Ali al-Kharisi.
Captagon is the brand name for the amphetamine phenelhylline, a synthetic stimulant known for psychoactive and stimulant effects. The drug is fairly popular in the Middle East.
"The smuggling operation is the largest one that has been foiled through the Beirut International Airport," AFP cited an anonymous Lebanese security source.
When detained, the five Saudis had the drugs neatly packed into cases, which were waiting to be put onto a private plane headed to Saudi Arabia, according to information given to Sputnik.
The Kingdom has already beheaded more than 130 people this year for the crimes such as the possession of drugs, drug trafficking, murder, armed robbery, rape and apostasy.
Members of the Saudi royal family have had problems with the authorities of other countries in the past.
Last month, another Saudi prince was arrested in Los Angeles accused of taking cocaine, sexually assaulting a maid, threatening to kill women who refused his sexual advances and having sex with his male aide.
Back in 2013, a Saudi princess enslaved a woman from Kenya making her a housemaid, but criminal charges against the princess were eventually dropped.