The 25-year-old was addicted to alcohol and cocaine for two years, after which he decided to seek professional help in March this year.
He left California and stayed in a private residence where he received intensive outpatient care for several weeks.
According to tmz.com, he came back here to shoot for Seth Rogen's film "Neighbors", but he faced a major relapse during the shooting of the movie.
Efron wasted no time in getting second dose of outpatient care.
Issues like bad company, issues with family, not a good career and personal life are said to be the reason behind Efron's submission to cocaine and alcohol.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ