Speaking at Comic-Con, Linda Wallem explained that Jackie (Edie Falco) will continue to struggle with her drug addiction.
According to E! Online, she said: "We're not interested in seeing Jackie in rehab. She's dug herself a little bit of a hole, so it's really fun to start in that place."
Wallem added that the show will focus on Jackie's attempts to conceal her drug abuse.
"It's more of a game to her now, having to hide it," she said. "Where she hides it, where she gets it. We're going to bring in some interesting people from last year that might surprise you, because her and Eddie [Paul Schulze] aren't getting along so well."
Nurse Jackie will return for a new season on Showtime next year.