verordnet
prescribed / ordered
Ordered or prescribed by an official body or an authority (e.g., a doctor or a government).
Die vom Arzt verordnete Bettruhe hat ihm gutgetan.
The bed rest prescribed by the doctor did him good.

prescribed / ordered
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prescribed / ordered
Ordered or prescribed by an official body or an authority (e.g., a doctor or a government).
Die vom Arzt verordnete Bettruhe hat ihm gutgetan.
The bed rest prescribed by the doctor did him good.

'Verordnet' (prescribed/ordered) is the past participle of the verb 'verordnen' (to prescribe/order) and is used like an adjective. The verb 'verordnen' means that an authority officially orders or prescribes something.
Die verordnete Diät war sehr streng.
The prescribed diet was very strict.
To name the authority that has prescribed or ordered something, you use the preposition 'von' followed by the dative. This is a very common construction.
Die von der Regierung verordneten Maßnahmen wurden aufgehoben.
The measures ordered by the government were lifted.
The word is often used in medical or administrative contexts. Typical combinations are 'verordnete Medikamente' (prescribed medication), 'verordnete Bettruhe' (prescribed bed rest), or 'staatlich verordnete Regeln' (state-imposed rules).
Er muss die vom Arzt verordneten Medikamente dreimal täglich nehmen.
He has to take the medication prescribed by the doctor three times a day.
voluntary
'freiwillig' and 'verordnet' can both describe whether someone does something by their own choice or whether it is prescribed. 'freiwillig' fits when the person decides for themselves. 'verordnet' is used when an authority orders something, for example a doctor, a public authority, or a government. So the contrast is: personal choice versus official order. 'verordnet' is especially natural with medicine, rules, or measures.

Die verordnete Ruhe hilft Luis nach der Operation.
The prescribed rest is helping Luis after the operation.
Ich mache freiwillig einen Erste-Hilfe-Kurs im Krankenhaus.
I am taking a first-aid course at the hospital voluntarily.