Is Ketamine Illegal in Australia? A Complete Guide to Medical Use, Penalties, and Border Enforcement

Ketamine is a Schedule 8 controlled substance in Australia, which means it is legally available only through prescription for specific medical purposes. However, possessing ketamine without a valid prescription is a criminal offence, and importing it into the country carries severe penalties including potential life imprisonment. Consequently, the answer to whether ketamine is illegal depends entirely on the context: it is legal as a medicine, but illegal as a recreational substance.

The Legal Status: Schedule 8 Controlled Medicine

Ketamine occupies a unique legal position in Australia. The Therapeutic Goods Administration (TGA) has approved it as an anaesthetic drug for human therapeutic use. The Poisons Standard classifies ketamine as a Schedule 8 substance, placing it in the same category as other controlled medicines like morphine and oxycodone.

This classification means ketamine is prescription-only. Only authorised medical practitioners can prescribe it, and pharmacists dispense it under strict controls. In practice, this means:

• Medical professionals use ketamine legally in hospitals for anaesthesia and pain management
• Psychiatrists can prescribe it for treatment-resistant depression under specific state-based authorisation frameworks
• Possessing ketamine without a valid prescription is a criminal offence

Penalties for Possession and Supply

The penalties for unauthorised ketamine possession vary by state and territory, but they are uniformly serious.

In the Northern Territory, a Supreme Court case involving 0.63 grams of ketamine at a music festival illustrates the severity of the legal approach. Although the offender possessed the drug for personal use, the quantity was six times over the legislated threshold for a commercial quantity. The court noted that because the quantity was technically a commercial amount, the maximum penalty was 25 years imprisonment.

The court ultimately imposed a good behaviour bond because there was no commercial element to the offending. However, the judge emphasised that “Schedule 1 drugs are considered to be most harmful in the community” and that the conviction itself represented “a grave penalty”.

Border Enforcement: A Surge in Ketamine Seizures

The Australian Border Force (ABF) has reported a dramatic increase in ketamine importation attempts. In January 2026 alone, ABF officers seized more than 438 kilograms of ketamine across New South Wales and Victoria, with an estimated street value of approximately $75 million. This quantity could have resulted in more than 8.5 million street-level deals.

The concealment methods criminals use are diverse and sophisticated. ABF officers have discovered ketamine hidden in:

• Shoe boxes (10kg from the United Kingdom)
• Medicine balls and weighted therapeutic cushion covers (27.5kg)
• Garden statues and plaster holiday figurines (4.5kg)
• Confectionary packages (6.8kg)
• Teddy bears (6.8kg)
• Aquarium gravel (32kg)

ABF Superintendent Asha Patwardhan stated that “detections of ketamine had increased at the border in 2026, demonstrating a clear supply and demand market”.

Real Cases: Life Imprisonment on the Table

The consequences of ketamine importation are severe. In April 2026, a 25-year-old Merrylands man faced court charged over his alleged role in importing 10 kilograms of ketamine from the United Kingdom. He faced a maximum penalty of life imprisonment if convicted.

In a separate case in March 2026, a 44-year-old Sydney man was charged after authorities intercepted 27.5 kilograms of ketamine concealed in medicine balls and cushion covers. He also faced a maximum penalty of life imprisonment.

AFP Detective Superintendent Morgen Blunden issued a clear warning: “Ketamine consumption can cause memory loss, feelings of detachment from one’s body, slowed breathing and the inability to perceive dangers. If combined with alcohol or other drugs, it could be fatal to users”.

Medical Use for Treatment-Resistant Depression

Despite its status as a controlled substance, ketamine has legitimate medical applications beyond anaesthesia. The TGA has approved esketamine nasal spray (Spravato) for treatment-resistant depression.

However, access is tightly regulated. In New South Wales, only psychiatrists can prescribe esketamine or ketamine for treatment-resistant depression. All other prescribers must refer the patient to a psychiatrist. The medication must be administered under direct medical supervision in a healthcare setting with established monitoring procedures.

In Tasmania, psychiatrists must seek authorisation under Section 59E of the Poisons Act 1971 before initiating treatment. The authorisation process requires the psychiatrist to provide clinical information demonstrating they have minimised the risks of harm from the experimental use of ketamine.

Rising Recreational Use: The Wastewater Evidence

While ketamine remains illegal for recreational purposes, wastewater monitoring data reveals increasing non-medical use across Australia. A study analysing samples from up to 50 wastewater treatment plants between December 2020 and April 2025 found that norketamine mass loads have been increasing, particularly in sites with higher socioeconomic status.

The study also observed substantially higher mass loads on weekends compared to weekdays, suggesting increased non-medical use at those times. Nationally, norketamine mass loads were higher in major city areas compared to regional Australia.

Survey data supports this trend. The Ecstasy and Related Drugs Reporting System found that 53% of participants reported non-medical ketamine use in 2024, with 12% of recent users reporting weekly use or more. The National Drug Strategy Household Survey reported that ketamine use increased from 1.9% to 4.3% ever used between 2016 and 2022-23, equating to around 900,000 people.

Summary

Ketamine is not illegal when prescribed and administered by authorised medical professionals for approved purposes such as anaesthesia or treatment-resistant depression. However, possessing ketamine without a prescription is a criminal offence with penalties that can reach 25 years imprisonment in cases involving commercial quantities.

The Australian Border Force has intensified its enforcement efforts, seizing record quantities of ketamine in 2026 and charging multiple individuals with importation offences carrying maximum penalties of life imprisonment. While wastewater data shows rising recreational use, particularly in higher socioeconomic areas and on weekends, the legal consequences for unauthorised possession and importation remain severe.