GleestarKevin McHaleis opening up about the “intervention"Jenna UshkowitzandNaya Riveraonce staged for him over his steroid use.

However, the drug came with a slight caveat.

But his use of the steroids also raised some serious red flags for his costars.

Naya Rivera, Kevin McHale, and Jenna Ushkowitz

‘Glee’ stars Naya Rivera, Kevin McHale, and Jenna Ushkowitz.Bennett Raglin/WireImage

“You were all like, ‘So, hey, um…

So why are you taking these steroids?’

“[They said], ‘But it’s not the antibiotic, right?’

I’m like, ‘No.’

[They’re] like, ‘Okay, I think you should stop taking them.’

And I was like, ‘Why?!'”

The pair began to list the negative side effects they were seeing in their friend’s behavior.

“‘You’re not sleeping.

You’re acting crazy,'” he recalled them saying at the time.

“‘you better stop taking them.'”

“I was like, ‘Yeah, I think you’re right,'” he said.

“I hadn’t slept in days.

I was losing my mind.”

Ushkowitz went on to explain that McHale’s steroid use, in the beginning, was “necessary.”

Still, McHale added, “It was a hard lesson to learn.”

Listen to McHale discuss the intervention in the podcast episode above.