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Normally, only final judgments can be appealed. In the case of preliminary injunctions, however, because they are granted at the outset of litigation and can remain in effect for months or even years even if granted in error, a litigant is allowed to file an interlocutory appeal of a preliminary injunction. The exact procedure of filing such an appeal will vary from jurisdiction to jurisdiction, and failure to file a timely appeal may cause that appeal’s failure. Even in cases where an appeal is not possible, it still may be possible to modify or dissolve the injunction.