Marilyn Manson collapsed on stage during a concert in Houston on Saturday night due to suspected 'heat poisoning', according to reports.

Right before the show at Cynthia Woods Pavilion kicked off, Manson's tour manager escorted photographers out of the pit because the 49-year-old performer wasn't feeling well and didn't want his picture taken, Houston Press claimed.

Manson was energetic and strong during the first his first two numbers, but just before launching into his third he complained that he was suffering from 'heat poisoning', as seen in one fan's YouTube video.

At about the 4:45-mark in the six-minute video, Manson can be seen sitting on the edge of the stage belting out the fifth song of the night, Sweet Dreams, before he suddenly falls backward.

He managed to sit back up and finish the song before walking off stage, never returning to complete the set.

A dramatic video shows moment Marilyn Manson collapses on stage during his concert in Houston on Saturday after complaining of 'heat poisoning'. The 49-year-old rocker can be seen sitting on the stage as he belts out Sweet Dreams when he suddenly falls backward

Manson managed to sit up and finish the song before walking off stage and never returning

Rob Zombie, who is co-headlining the Twins of Evil - The Second Coming Tour with Manson, took the stage and performed for the remainder of the concert.

At one point he asked the audience to sing loudly to lift Manson's spirits.

'My dear friend Mr. Manson is feeling under the weather,' Zombie said to the crowd.

'He's probably on the bus feeling like cr**. I need a partner for the next song so let's sing really loud and make him feel better.'

Manson, whose real name is Brian Hugh Warner, addressed fans on Twitter around 1am Monday, writing: 'Thanks Houston for being understanding. I ended up in doctor’s care, but I gave it my best and you guys were amazing.'

Before the show, Manson's tour manager had escorted photographers out of the pit because the performer wasn't feeling well and didn't want his picture taken

Manson apologized to fans on Twitter early Monday morning, revealing he'd seen a doctor