Zac Efron had two rehab stints this year

"High School Musical" star Zac Efron has reportedly been to rehab twice this year.
The 25-year-old actor had checked himself into a clinic to help him battle what is believed to be a cocaine and alcohol addiction for a second time in April following a relapse, reported TMZ online.
"He initially reached out for help to combat his apparent two-year struggle with class A drugs in March, but was forced to return in April when he began abusing the same substances while filming Seth Rogen's comedy 'Neighbors'," a source said.
Efron is said to have acted 'erratically' causing concern among those who worked alongside him which led him to seek care again.

The source also suggested that the actor's struggles has been due to his personal and professional problems.
"He is disappointed that his film career has not had the same success as Disney's 'High School Musical' franchise which catapulted him into the spotlight," it said.
In addition, it is believed that Efron is facing 'girl issues' and was hanging out with 'a bad group of friends', which he has since cut out of his life.