Mandamus and prohibition are often described as mirror images of each other.

If mandamus is the writ that compels action, prohibition is its counterpart: the writ that prevents a lower court or tribunal from taking an action it has no legal authority to take.

What prohibition addresses

A writ of prohibition is typically sought when a lower court is about to exercise jurisdiction it does not have — for example, proceeding with a case after a party has been dismissed, or asserting authority over a matter that belongs exclusively to another tribunal.

The shared procedural framework

Because both writs address the conduct of lower courts or officials and share the same historical common-law origin, many jurisdictions apply nearly identical procedural rules to mandamus and prohibition petitions, often filing them under the same rule or statute.

The "no adequate remedy" element in both

Just as mandamus requires no adequate remedy by ordinary appeal, prohibition requires the same showing — that waiting for the lower court to finish the case and then appealing would not adequately address the harm of allowing an unauthorized proceeding to continue.

When the two writs overlap in practice

Some disputes can be framed as either a mandamus or a prohibition claim, depending on how the underlying problem is characterized — for instance, asking a court to stop hearing a claim (prohibition) versus asking it to dismiss the claim (which could be framed as compelling a ministerial dismissal, arguably mandamus). Courts generally look past the label to the practical substance of what is being requested.

Why this distinction still matters procedurally

Even where the underlying jurisdictions and standards are similar, correctly identifying which writ actually fits the relief sought helps ensure the petition is evaluated under the right legal framework from the outset.