Paul Rudd has wasted no time in finding his follow-up to the highly anticipated “Ant-Man.”

Rudd is set to star in the adaptation of Jonathan Evison novel “The Revised Fundamentals of Caregiving.”

Rob Burnett, five-time Emmy Award-winning executive producer of “The Late Show With David Letterman,” will direct, and he is also adapting the script.

Story follows the touching friendship between Ben Benjamin (Rudd) and a young adult stricken with Duchenne Muscular Dystrophy. The two form a unique bond and gently push each other toward re-engaging in life in an affecting, funny and inspirational tale of broken people coming to terms with difficult lives.

Donna Gigliotti (“Silver Linings Playbook”) will produce along with James Spies (“Constantine”). Production begins Jan. 22 in Atlanta.

The film is a Levantine Films production, in association with Letterman’s Worldwide Pants, and is financed by a group of private investors that include Levantine Films.

Rudd surprised the biz last year after winning the role of superhero Scott Lang, aka Ant-Man, in Marvel’s “Ant-Man,” which bows on July 17. Rudd is best known for his comedic roles, but fans of the actor look to be happy with the decision to give him an action-heavy role following the release of the trailer that bowed during the premiere of Marvel’s “Agent Carter” TV series.

Rudd, who was most recently seen in “Anchorman 2,” is repped by Brillstein, UTA and Jackoway Tyerman Wertheimer Austen Mandelbaum Morris & Klein.

UTA will co-represent the film’s domestic distribution with CAA, which represents Burnett and Evison.

Burnett is also represented by attorney Thomas D. Selz; Evison by Mollie Glick. Levantine Films was represented by Kenneth Weinrib.