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NDIS explained

What is chemical restraint under the NDIS?

Updated 19 October 2026 · Checked against official NDIS and government sources

In plain English

Chemical restraint is using medication or a chemical substance mainly to influence a person's behaviour. It does not include medication a doctor prescribes to treat, or enable treatment of, a diagnosed mental disorder, physical illness or physical condition. As a regulated restrictive practice, it can only be used by a registered provider, under a behaviour support plan, with state or territory authorisation, and must be reported.

What counts as chemical restraint

The NDIS (Restrictive Practices and Behaviour Support) Rules 2018 define chemical restraint as the use of medication or a chemical substance for the primary purpose of influencing a person's behaviour.

The key word is purpose. The same medicine can be chemical restraint for one person and treatment for another. It is not chemical restraint when a medical practitioner prescribes it to treat, or to enable treatment of, a diagnosed mental disorder, a physical illness or a physical condition.

PRN and routine medication

Medication can be given on a regular schedule (routine) or only when needed, often called PRN. Either can be chemical restraint if the main reason it is given is to change behaviour.

PRN medication needs particular care, because workers decide when to give it. If a PRN is used to calm or settle someone whose behaviour is of concern, the behaviour support plan should explain exactly when it can be used, what must be tried first, and how its use is recorded.

The medication purpose form

Providers who give medication need to know why it was prescribed. Only a medical practitioner can decide what to prescribe and for what purpose, so providers are expected to ask the prescriber when the purpose is unclear.

The NDIS Commission has an optional Medication Purpose Form for this. The doctor ticks whether the primary purpose is treatment of a diagnosed condition or to influence behaviour, and notes side effects. You can take it to each medical review or whenever a medication starts or changes. Some states have their own version, which providers can still use.

The rules if it is chemical restraint

If a medication is a chemical restraint, the same rules apply as for any regulated restrictive practice:

  • Only a registered NDIS provider can use it. Unregistered providers must not
  • It must be in a behaviour support plan written by an NDIS behaviour support practitioner, alongside positive strategies
  • It must be authorised under the state or territory process where the person lives
  • It must be the least restrictive option, used as a last resort and for the shortest time
  • The implementing provider reports its use to the NDIS Commission every month, including months when it was not used

When it is unauthorised

Giving a medication for behaviour without authorisation, outside a behaviour support plan, or differently from the plan is an unauthorised restrictive practice. That is a reportable incident the registered provider must report to the NDIS Commission.

If a provider realises a regular medication is actually a chemical restraint and there is no plan yet, it must engage a behaviour support practitioner. An interim plan is due within 1 month of the practice first being used and a comprehensive plan within 6 months.

Questions families can ask

Chemical restraint can have real side effects, so it is fair to ask questions. Good ones include:

  • What is this medication prescribed for, and has the doctor confirmed that in writing?
  • Is it in the behaviour support plan, and has it been authorised?
  • What is tried before a PRN is given, and who decides?
  • How are side effects and changes in behaviour being recorded and shared with the doctor?
  • What is the plan to reduce or stop it over time?
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Common questions

Is prescribed medication always chemical restraint?

No. Medication prescribed to treat a diagnosed mental disorder, physical illness or physical condition is not chemical restraint. It is chemical restraint when the primary purpose is to influence behaviour.

Is PRN medication a restrictive practice?

It can be. A PRN given mainly to change or settle behaviour is chemical restraint and must be in a behaviour support plan and authorised.

Who decides if a medication is a chemical restraint?

The prescribing doctor explains the purpose of the medication. The provider uses that information, for example through the Medication Purpose Form, and the behaviour support practitioner includes any chemical restraint in the plan.

Can a support worker refuse to give a chemical restraint?

Workers must follow the authorised behaviour support plan and raise concerns with their provider. If a medication is being used to manage behaviour without a plan or authorisation, it should be reported.

Does chemical restraint have to be reported every time?

Authorised use is reported in the implementing provider's monthly report to the NDIS Commission. Unauthorised use is a reportable incident.

Sources

This page is general information, not advice about your plan. NDIS rules change, so check the NDIA or your plan manager before making decisions.

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