Legal remedies for improper joinder include filing a motion to sever improperly joined claims or parties so each matter proceeds separately, moving to dismiss particular causes of action or parties for failure to state a claim or for misjoinder, seeking remand if joinder was used to defeat federal jurisdiction (or moving to retain/remove where appropriate), and asking the court to strike irrelevant or prejudicial allegations; courts may also order amendment of pleadings, bifurcate issues or trials, grant protective orders or limit discovery, transfer claims to proper venues, impose sanctions for abusive joinder, or permit interlocutory review in some jurisdictions. Best-practice lawyers choose the remedy that minimizes prejudice and delay, support motions with clear statutory and case-law authority, memorialize meet-and-confer efforts, propose pragmatic case-management orders (timelines, narrowed discovery, bifurcation), preserve issues for appeal, and where sensible negotiate amendments or stipulations to resolve joinder defects without costly litigation—while always tailoring strategy to local rules and the client’s objectives.