Performances at the Seminole Hard Rock Hotel & Casino in Hollywood, FL, on March 4 and 5; at the UCF Arena in Orlando, FL, on March 6; and at the Sundome in Tampa, FL, March 7 have been postponed.

Williams, according to his official website, "was experiencing shortness of breath and is currently being evaluated by doctors who are recommending a week of rest."

The four shows will be rescheduled, and new dates will be announced shortly. Tickets for all performances will be honored once the new dates are set.

Williams is scheduled to resume performances in Weapons of Self-Destruction March 11 in Jacksonville, FL.

Weapons will arrive on Broadway at the Neil Simon Theatre April 23. The show will be presented on Broadway by James L. Nederlander and Ron Delsener.

Weapons of Self-Destruction, according to press notes, "highlights Williams’ trademark free associations and riffs on social and political absurdities."

The actor-writer-comedian, who became known during his work in "Mork & Mindy" — a spinoff created from a guest spot on "Happy Days" — is widely hailed for his madcap improvisational humor in movies such as "Good Morning, Vietnam," "Aladdin," "The Birdcage," "Mrs. Doubtfire" and "Death to Smoochy," among others. Williams has often taken on dramatic roles as well in such films as "The Fisher King," "Awakenings," "Insomnia" and his Academy Award-winning turn in "Good Will Hunting." On stage the actor may be remembered for his performance as Estragon opposite Steve Martin's Vladimir in the Mike Nichols-directed production of Samuel Beckett's Waiting for Godot.

Williams was seen on Broadway in Robin Williams: Live on Broadway (July 11-14, 2002) and V.I.P. Night on Broadway (April 22, 1979).

The Neil Simon Theatre is located in Manhattan at 250 West 52nd Street. Tickets are available at the Neil Simon box office or via ticketmaster.com or robinwilliams.com.