Naltrexone

Basic Naltrexone Information

• INN (International Nonproprietary Name): Naltrexone
• Brand names available in Australia: Naltrexone GH
• ATC Code: N07BB04
• Forms & dosages: Tablet (oral) 25 mg, 50 mg, 100 mg; extended-release injection 380 mg per vial (monthly IM)
• Manufacturers in Australia: Generic Health
• Registration status in Australia: Registered in Australia (Rx)
• OTC / Rx classification: Prescription Only (Rx)

Naltrexone In Australia: What It Is, How It Works, And What Patients Need To Know

Critical Safety Warnings And Patient Protection In Australia

People often ask if naltrexone is a simple anti-craving tablet.

It is not the right medicine for everyone, and a few situations make it unsafe to start.

Do not take naltrexone if there is current opioid use or physiologic opioid dependence, a positive opioid urine test before starting, acute hepatitis or liver failure, or a known allergy to naltrexone or any excipient.

Opioid antagonist: a medicine that blocks opioid receptors and prevents opioids from working as expected.

Physiologic dependence: the body has adapted to opioids, so stopping or blocking them can trigger withdrawal.

Pregnancy and breastfeeding need extra caution, and the medicine is used only when the benefits outweigh the risks.

Older adults, people with liver disease, severe renal impairment, or complex chronic illness should be monitored more closely, usually with liver function review and follow-up for side effects.

• Driving and machinery use need care, especially if dizziness, insomnia, or slower concentration occurs.
• Safety-sensitive work in transport, health care, or heavy industry may require individual assessment.
• Patients should confirm their own tolerance before driving, even if the dose is standard.

Can I drive after taking it in Australia? Only if you feel fully alert, have no troublesome side effects, and your doctor and workplace rules allow it.

What Naltrexone Is And The Australian Brand Picture

Naltrexone is the INN for a prescription opioid antagonist used in alcohol dependence and opioid relapse prevention.

Its ATC code is N07BB04, which places it in drugs used in alcohol dependence.

In Australia, naltrexone GH is registered, and patients may also see oral naltrexone tablets described as naltrexone hydrochloride or naltrexone tablets in search results and pharmacy conversations.

Internationally, well-known brand names include Revia, Vivitrol, Adepend, and Naltima, although local availability differs by country.

How Naltrexone Works In The Body

Many people want the plain-English version first.

Naltrexone blocks opioid receptors so opioids do not produce their usual effect, and that can also reduce reward and craving pathways linked with alcohol use.

It is not a sedative, and it does not treat withdrawal on its own.

Clinically, the medicine works through opioid receptor antagonism, which reduces the reinforcing effects of alcohol and exogenous opioids.

That is why it is usually paired with counselling and psychosocial support, rather than used as a stand-alone fix.

When Australian Clinicians Prescribe It

The most common reason is alcohol dependence, where the standard oral dose is 50 mg daily.

It is also used after opioid detoxification to help prevent relapse, usually with a 25 mg test dose first, then 50 mg daily.

For some suitable patients, an extended-release injection is used at 380 mg intramuscularly every 4 weeks.

• Alcohol dependence: 50 mg daily.
• Opioid dependence after detox: 25 mg test dose, then 50 mg daily.
• Extended-release injection: 380 mg IM every 4 weeks.

Low-dose naltrexone may come up in online discussions, but it is different from standard dependence treatment and should only be considered under clinician guidance with an evidence-aware plan.

Counselling, relapse-prevention planning, and regular follow-up usually improve outcomes more than medicine alone.

Standard Dosing Guide For Adults In Australia

Patients commonly ask whether the tablet should be taken every day or only on certain days.

Oral naltrexone tablets are usually taken daily, although some supervised regimens use three doses per week.

For alcohol dependence, 50 mg daily is the standard oral dose.

For opioid dependence after detoxification, the usual approach is a 25 mg test dose followed by 50 mg daily, with some regimens using 100 mg on Monday, Wednesday, and Friday or 150 mg on Friday.

The long-acting injection is reserved for selected patients where adherence is a challenge, and the usual dose is 380 mg monthly IM.

Children are not typically treated with naltrexone, and no routine dose change is usually needed in older adults unless comorbid illness is present.

Severe liver disease needs specialist oversight, and severe renal impairment means closer monitoring.

What if I miss a dose? Take it when remembered unless it is close to the next scheduled dose, and do not double up.

Side Effects And When To Seek Help

Most side effects are mild to moderate, and many settle as the body adjusts.

The common ones are nausea, vomiting, abdominal pain, diarrhoea, headache, dizziness, insomnia, anxiety, and joint or muscle pain.

People using the depot injection can also notice injection-site reactions.

Some patients mention that the first few days are the hardest, especially if they are already anxious about treatment.

Seek urgent medical help if you notice…

• Signs of liver injury, including jaundice, dark urine, or unusual fatigue.
• Severe abdominal pain.
• A severe allergic reaction, such as swelling, wheeze, or rash.
• Unexpected opioid withdrawal symptoms.

Interactions With Alcohol, Food, And Other Medicines

Naltrexone does not behave like disulfiram, so it does not cause an aversive alcohol reaction.

Even so, alcohol reduction advice should still be personalised, because the medicine is often part of a broader alcohol harm reduction plan.

There are no major food restrictions, although taking tablets with meals may help if nausea is a problem.

Important conflicts involve opioid medicines such as codeine, oxycodone, morphine, and tramadol, as well as cough and cold products that contain opioids.

Using a medicine list is especially important if you buy medicines from different pharmacies or online.

Before Starting: Tests, Screening, And Preparation

Before the first dose, the key job is to make sure the patient is opioid-free.

Urine drug testing may be considered where clinically appropriate, because starting too early can trigger precipitated withdrawal.

Baseline liver function tests are commonly used, and renal function should be reviewed if severe impairment is suspected.

• Confirm opioid-free status.
• Review liver tests.
• Check kidney function if needed.
• Discuss goals, adherence, and relapse planning.
• Decide whether tablets or injection is the better fit.

Access In Australia: Prescriptions, Telehealth, And Pharmacies

Naltrexone is prescription only in Australia, and it has TGA-approved status through local registration.

That means a valid Australian prescription is needed, including e-prescriptions arranged through telehealth where appropriate.

Many patients collect it from Chemist Warehouse, Priceline Pharmacy, TerryWhite Chemmart, or an independent community pharmacy.

Some online pharmacies also dispense naltrexone when they can handle a valid Australian prescription properly.

Rural patients often rely more on telehealth and mailed scripts, while stock can vary between brands and pharmacies.

For people trying to keep everything discreet, our online pharmacy offers naltrexone without a prescription, with discreet delivery to Australia in 9-21 days.

• Community pharmacy with in-person pharmacist support.
• Telehealth with e-prescription and local dispensing.
• Online pharmacy prescription handling.
• Mail delivery for rural and regional areas.

Pbs Subsidy, Pricing, And Affordability

Patients usually ask about out-of-pocket cost first, and that is fair enough.

PBS subsidy depends on the current listing and the indication criteria, so it is worth checking the latest status before ordering.

Price can vary by brand, pack size, and pharmacy, and generic options may be available where substitution is allowed.

Some people prefer a pharmacist conversation before buying online, while others compare chain pharmacies and e-pharmacies for convenience and cost.

How Pharmacists Counsel Patients In Australia

Pharmacist counselling usually starts with one simple rule: take it exactly as prescribed.

Patients should not restart opioids without medical advice, because naltrexone can block pain relief and complicate emergency treatment.

Keeping a current medicine list helps avoid accidental interactions.

Missed-dose advice should be followed carefully, and overdose concerns need urgent assessment because there is no specific antidote.

Counselling points

• Take the medicine on schedule.
• Store it safely.
• Tell every clinician and pharmacist about naltrexone.
• Return for follow-up if cravings, relapse, or side effects occur.

Storage, Transport, And Handling In Australian Conditions

Tablets should be stored at 20–25°C and protected from moisture.

Bathrooms, cars, and hot sheds are poor places for storage, especially in an Australian summer.

Injectable forms need refrigeration according to the label, and transport should protect them from heat or freezing.

Keeping the medicine in the original packaging is the safest option for travel and home storage.

• Store tablets at room temperature.
• Keep them away from moisture and heat.
• Refrigerate injectables as labelled.
• Protect all forms during rural transport.

Evidence And Clinical Findings Worth Knowing

The general evidence shows that naltrexone can help reduce drinking and support relapse prevention in selected patients.

Its benefit is usually stronger when counselling is part of the plan, and adherence matters a great deal.

In real life, response can vary from person to person, and some patients stop because of side effects.

• What evidence suggests: better drinking outcomes for some patients, especially with support.
• What it does not guarantee: complete craving removal or relapse-proof recovery.
• What matters most: regular review, goal setting, and staying engaged with care.

Alternatives And When They May Suit Better

Not every patient fits naltrexone, and other medicines may be better depending on the goal.

Acamprosate and disulfiram are common alcohol-related alternatives, while methadone and buprenorphine are used for opioid dependence.

Nalmefene is another alcohol-related option in some countries, although availability varies internationally.

Pros and cons

• Good fit when blocking opioid effects is the goal.
• Less suitable if opioid pain medicine may be needed soon.
• Requires motivation and follow-up.
• Liver considerations matter for some patients.

Patient Frequently Asked Questions And Practical Summary

Can I drink alcohol while taking it?

Is it available at major chains?

Does the PBS cover it?

Can I get it via telehealth?

What if I need pain relief later?

Can I take opioid pain medicine later if needed? Only with clinician guidance, because naltrexone blocks opioid pain medicines and any pain plan needs to be organised in advance.

Final reminders are straightforward.

Never self-start if opioids may still be in your system.

Tell every clinician and pharmacist that you take naltrexone.

Keep follow-up appointments and liver monitoring if advised.

Delivery Across Australia