Adam Levine swore off drugs early on in his career after a strange experience on prescription medication Ambien.

The Maroon 5 frontman and his bandmate James Valentine mistook the sedatives for stimulants and took them while on tour, but instead of giving them a much-needed boost, the drug knocked them out cold - while they were waiting for dinner.

He says, "We had a brief experience one time with what I guess was Ambien. James Valentine and I, we didn't really know what it was... It was the first and last time we took this drug. But we were at Denny's (diner) at some shady part of the city of whatever part of the country we were in, and we took it and we ordered the food... and we woke up at the table, what must have been an hour (later)... I was like, 'Oh no' and James had his head down, so I was like, 'Hey man, hey, we should get out of here'. We didn't eat our food, we sheepishly paid our bills and walked out and everyone's looking (at us) like, 'What's wrong with these guys?'.

"And then since then I've never done drugs."