Reasonable and Necessary Medications in Workers Compensation: State-by-State Guide

Understand medication entitlement across NSW, Victoria, Queensland, and other Australian jurisdictions under workers compensation law.

Published: 4 April 2026

The Core Test: "Reasonably Necessary" Treatment in Workers Compensation

Across all Australian states and territories, workers compensation legislation provides entitlement to treatment that is "reasonably necessary" for a compensable work-related injury. While the precise wording varies slightly by jurisdiction, the underlying test is consistent: a medication must be clinically necessary to treat the injury, likely to contribute to recovery or functional improvement, and proportionate in cost to the benefit provided.

The critical distinction from health insurance is that workers compensation funds treatment of the injury, not the worker's general health. A medication addressing an unrelated health condition falls outside the scheme's scope, even if the worker is injured.

State-by-State Legislative Framework

The table below summarises how the "reasonably necessary" test is defined and applied across major Australian jurisdictions:

The Four-Part Test for Workers Compensation Medication Reasonableness

Across all jurisdictions, assess medication reasonableness using this framework:

Common Medication Disputes in Workers Compensation

Several medication categories generate recurring disputes and challenges in workers compensation claims. Understanding how to navigate these disputes protects you and provides clear rationale for decisions:

Opioid Medications

Opioid entitlement in workers compensation is increasingly scrutinised. While short-term opioids for acute post-injury pain are typically uncontested, long-term opioid prescribing raises questions about dependence risk, functional improvement, and return-to-work feasibility. If a worker has been on the same opioid dose for 12 months without functional progress and with no documented plan for withdrawal or reduction, the ongoing reasonableness of that medication can be challenged. Refer for pharmacy review to assess whether lower doses, opioid rotation, or alternative pain management strategies are appropriate.

Benzodiazepines

Benzodiazepines present similar challenges to opioids. Short-term use for acute anxiety or sleep disturbance post-injury is reasonable; long-term benzodiazepine use (beyond 2-4 weeks) is increasingly difficult to justify, particularly given risks of dependence and cognitive impairment that may impede rehabilitation. If a worker is on benzodiazepines long-term, question whether they are still necessary or whether alternative management (psychology, graduated withdrawal) is appropriate.

Medications for Conditions Predating or Unrelated to the Injury

If a worker was taking medication before the injury or the medication addresses a condition unrelated to the injury, it is not compensable under workers compensation. For example, if a worker injured their back at work and is on diabetes medication developed before the injury, the diabetes medication is not a workers compensation cost. However, if the injury exacerbates an existing condition (e.g., the back injury worsens existing pain and requires escalation of pain medication), the additional or escalated medication may be compensable. The distinction is whether the medication is for the injury or merely coincident with it.

Psychiatric Medications Following Workplace Injury

Psychological injury resulting from a workplace incident (e.g., assault, traumatic event) is increasingly recognised as a compensable injury in most Australian jurisdictions. Medications for resulting post-traumatic stress disorder, anxiety, or depression may therefore be reasonable and necessary. However, the connection between the workplace incident and the psychological injury must be clearly established, and the medication must be appropriate for the specific psychological condition. If a worker has pre-existing depression and the workplace incident is incidental, the medication may not be compensable.

When to Challenge Medication Reasonableness

As a claims manager, you should consider challenging or deferring a medication when:

• The medication is for a condition unrelated to the compensable injury (e.g., migraine prevention in a worker with a compensable back injury)
• The medication has been prescribed at doses substantially exceeding standard recommendations without documented justification
• The medication has been prescribed indefinitely without documented review or evidence of ongoing benefit
• The medication is masking pain or symptoms but preventing engagement in rehabilitation or return-to-work activities
• Cheaper, equally effective alternatives are available
• The prescriber has not documented the relationship between the medication and the injury, or the expected functional outcome
• The worker reports adverse effects that impede recovery or function
• Dependence risk (opioids, benzodiazepines) is increasing without documented risk mitigation plan

Return to Work and Medication Reassessment

As the worker's capacity for return to work improves, medications should be reassessed. Some medications (such as short-term pain relief or sleep aids) should be reduced or ceased as function improves. If a worker is returning to work, high-dose sedating medications may need review to ensure they do not impede safety or performance. Conversely, some medications (such as antidepressants for ongoing psychological recovery) may be continued beyond return to work if evidence of clinical benefit remains.

The key principle is that medication appropriateness should be reassessed regularly as the worker's functional status changes. Do not assume that a medication reasonable at the start of the claim remains reasonable 12 months later if the worker's capacity has improved substantially.

The Role of Independent Pharmacy Review in Workers Compensation

When medication disputes arise, or when you are uncertain about reasonableness, refer for independent pharmacy review. The pharmacist will assess:

• Clinical indication for each medication relative to the compensable injury
• Dosing and monitoring appropriateness
• Duration of therapy and evidence of ongoing benefit
• Interaction between medications
• Alignment with return-to-work goals and rehabilitation participation
• Cost-effectiveness and availability of alternatives

The pharmacist's report provides objective, evidence-based assessment that can support your decision and defend it against challenge from the worker or legal representative.

Documentation Standards for Workers Compensation Medication Decisions

Record the following in the claim file:

• The compensable injury and its nature
• Each medication prescribed, with date commenced, prescriber, indication, and dose
• Assessment of the medication's relationship to the compensable injury
• Clinical guidelines or evidence supporting the medication's use
• Documented functional benefit (or lack thereof)
• Any cost-effectiveness concerns
• Decision regarding entitlement (approved, approved with condition, not approved)
• If not approved, clear explanation of why it falls outside workers compensation scope
• Plan for reassessment if relevant (e.g., at return-to-work milestone)