What is a medication authority prescription?

Understanding PBS authority prescriptions and what they mean for your claimant's medication access.

Published: 3 April 2026 | Updated: 3 April 2026

What Makes a Prescription an "Authority" Prescription

In Australia, the Pharmaceutical Benefits Scheme (PBS) controls which medications are subsidized and under what circumstances. Some medications are available as open prescriptions (doctors can prescribe them freely), but others are restricted. Authority prescriptions exist for restricted medications where the prescriber must demonstrate that specific clinical criteria are met before the medication can be subsidized.

When a medication is "authority-required," the doctor doesn't simply write a prescription and submit it to the pharmacist. Instead, they must contact the PBS (typically via telephone or online system) to seek approval. They explain why the patient needs this medication, what treatments have been tried, and why this medication is appropriate. The PBS assesses whether the clinical criteria are met. If approved, an authority number is issued. Only then can the prescription be dispensed under PBS subsidy.

For your insurance claims, authority prescriptions have specific relevance. They indicate that the medication is restricted for good reason. The restriction exists because the medication is expensive, has serious side effects, or should only be used when specific clinical criteria are met. An authority prescription is essentially the PBS saying, "This medication is available, but not for everyone; the prescriber must justify its use."

Why Authority Restrictions Exist

The PBS doesn't restrict medications randomly. Restrictions exist for several important reasons.

High Cost, Limited Benefit

Some medications are very expensive but only beneficial for specific patient populations. Authority restrictions ensure the medication is used only when benefit justifies the cost. Biologic medications for rheumatoid arthritis, for example, are expensive and restricted to patients who haven't responded to cheaper, first-line treatments. This prevents expensive medications from being used when cheaper alternatives would work.

Safety Concerns

Some medications have significant side effects or serious contraindications. Authority requirements ensure these medications are only used when clinical judgment supports the risk. Strong opioids, for instance, are restricted because of addiction and overdose risk. Seeing that a medication requires authority should raise your attention to whether this high-risk medication is truly necessary for your claimant.

Specific Clinical Criteria

Some medications only work for specific patient subtypes. A medication might be effective for depression with certain characteristics but not for depression in general. Authority criteria specify which patients should receive the medication. This prevents prescribers from using expensive, specialized medications for broad indications where first-line treatments would be appropriate.

Trial of Alternatives First

For many authority medications, PBS criteria require that the patient has already tried first-line treatments. A patient must fail on cheaper, evidence-based first treatment before accessing the expensive, specialized medication. This ensures resources are used efficiently. Authority criteria might state, "This medication is available only after the patient has failed treatment with at least two first-line antidepressants," ensuring expensive second-line medications are reserved for appropriate patients.

Types of Authority Requirements

Not all authority restrictions are identical. Different medications have different restriction levels.

Level One Authority

The doctor can apply for authority but doesn't need supporting documentation. The clinical criteria are straightforward, and the doctor's assertion that the criteria are met is sufficient. These are typically less restrictive medications or situations where verification is easy.

Level Two Authority

The doctor must provide evidence supporting their request. Pathology results, specialist reports, or previous treatment details must accompany the application. The PBS assesses not just the doctor's claim that criteria are met but the objective evidence. This is more stringent and reserved for expensive or high-risk medications.

Restricted Benefit PBS Items

Some medications have ongoing restrictions. The prescriber must apply and reapply at specified intervals (every few months or annually). The medication is approved for limited supply. This prevents indefinite access to restricted medications and ensures ongoing assessment that the patient still meets criteria.

Authority Prescriptions in Insurance Claims

When reviewing your claimant's medications, seeing an authority prescription should prompt specific questions:

Does the Claimant Meet the Authority Criteria?

If the medication is authority-required, specific clinical criteria determined the prescriber could apply for it. Is your claimant documented to meet those criteria? If the medication is restricted due to safety concerns, is your claimant appropriate for that risk level? A medication review assesses whether the authority prescription is justified.

Has the Prescriber Applied for Authority Correctly?

Sometimes doctors prescribe authority-required medications without actually obtaining authority approval. The prescription is written, but the formal authority wasn't sought. The patient might be paying full price, or there might be an undisclosed gap in subsidy. Confirming that authority was properly obtained is important.

Is the Medication Still Appropriate?

Authority prescriptions are often prescribed with specific timelines in mind. A medication approved for three months assumes reassessment will occur at three months. If your claimant continues the medication indefinitely without reassessment, the prescriber might not be following the authority conditions. This matters because the authority was granted under specific conditions; if those conditions change (e.g., the patient's condition improves, cheaper alternatives become effective), the authority might no longer be justified.

Authority Prescriptions and Insurer Liability

When your insurer provides medication benefits, authority prescriptions can create specific considerations. If your insurer covers the medication but the prescriber didn't properly obtain authority, is the insurer responsible for the full cost? If the medication was approved under authority criteria that no longer apply, should the insurer continue funding it?

These questions highlight why medication review is valuable. A pharmacist can verify that authority prescriptions were properly obtained, confirm that the claimant still meets the criteria for which authority was granted, and assess whether the medication remains appropriate or whether alternatives should be considered.

Real-World Insurance Scenarios

Scenario One: Authority Still Valid

Your claimant with severe, treatment-resistant depression is on an expensive biologic medication that requires Level Two authority. The prescriber correctly obtained authority, documented that the claimant had failed two first-line antidepressants, and the medication is working well. The authority was justified then and remains appropriate now. Continuing the medication makes sense.

Scenario Two: Authority Criteria No Longer Met

Your claimant was approved for an expensive pain medication under authority criteria: failed on three first-line medications and has severe, documented pain. Two years later, pain has improved significantly, and the claimant actually reports they'd like to try stopping the medication. The original authority criteria were met, but they may no longer be. Does the claimant still need this expensive medication? A medication review identifies this situation and recommends reassessment.

Scenario Three: Authority Not Properly Obtained

Your claimant is prescribed a biologic medication that requires authority. The prescription was written, but the prescriber didn't formally apply for authority approval. The claimant paid full cost for several months before a pharmacy noticed and applied retroactively. Your insurer is now questioned about whether to cover those early months. Proper oversight of authority prescriptions prevents these situations.

Monitoring Authority Prescriptions

To manage authority medications effectively in your claims, consider these steps:

• Verify that authority prescriptions were properly approved before reimbursing or covering them
• Understand the clinical criteria for which authority was granted
• Monitor whether those criteria remain applicable as treatment progresses
• Watch for authority prescriptions that have become routine; sometimes they're continued without reassessment
• Arrange for periodic medication reviews to assess whether authority medications remain appropriate and justified

The Bottom Line

Authority prescriptions are restricted medications where clinical criteria must be met before PBS subsidy. They exist for good reason: the medications are expensive, risky, or specialized. For your insurance claims, an authority prescription should prompt specific questions about whether the claimant truly meets the criteria and whether the medication remains appropriate. Medication reviews verify that authority prescriptions are justified and that expensive medications are being used appropriately.