The Bret Michaels concert scheduled for Thursday, March 26 at Horseshoe Hotel Casino in Elizabeth, Indiana has been postponed.

According to a posting on the venue's web site, the POISON frontman is suffering from a severe case of laryngitis.

Tickets purchased for the show will be honored on the new show date, or refunds will be issued at the point of purchase. Horseshow said it will issue refunds on Thursday, March 26, beginning at 4 p.m. The new concert date will be posted on HorseshoeIndiana.com as soon as it is known.

Bret Michaels' autobiography, "Roses & Thorns: The Reality of My Rock & Roll Fantasy", is set to hit bookstores June 23.

According to a rep for Michaels, the book, which is being published by Simon & Schuster, will take readers through the rocker's humble upbringing in Harrisburg, Pennsylvania (where he struggled with childhood diabetes), his wild ride with POISON, the car crashes that nearly took his life, and the 10-year journey to reinvent himself on VH1's top-rated show "Rock of Love".

"It will give people the untold story," Michaels recently told Billboard.com. "It gives you the sex, the drugs, the rock 'n' roll, but it also gives you the diabetes. It gives you every aspect of my life and what I'm going through. I think it's pretty frank. It's honest. It's at times self-deprecating. It's about what happens when you try to live out your dream and the reality of it all sets in and it's the hardest and the strangest thing you will ever do. I think when you read it you'll really get the understanding of what it's all about."