Naltrexone

Basic Naltrexone Information

• INN (International Nonproprietary Name): Naltrexone
• Brand names available in United Kingdom: Naltrexone Accord
• ATC Code: N07BB04
• Forms & dosages: Tablet (oral) 25 mg, 50 mg, 100 mg; Extended-release injection 380 mg per vial (monthly IM)
• Manufacturers in United Kingdom: Accord Healthcare
• Registration status in United Kingdom: Prescription Only (Rx)
• OTC / Rx classification: Prescription Only (Rx) in all major jurisdictions

Naltrexone At A Glance: What UK Patients Ask First

Thinking about naltrexone usually starts with a simple set of questions.

Can it help with alcohol cravings, is it prescription only, and is the price manageable through an NHS prescription or a private prescription?

In day-to-day pharmacy practice, naltrexone tablets are most often used for alcohol dependence support and for opioid dependence after detoxification.

The oral tablets are commonly 50 mg, while the monthly Vivitrol injection is the extended-release option used in some markets.

Some patients know the older brand name Revia, while in the UK the local product context includes Naltrexone Accord.

For many people, the first worry is suitability, especially if opioids were used recently or if there is liver disease.

In the UK, supply may come through an NHS pharmacy, a private pharmacy, or an online pharmacy using an electronic prescription.

Boots, LloydsPharmacy and Superdrug all operate within the familiar UK pharmacy landscape, and responsible services will always check the prescription and the clinical details before supply.

Tablets means oral naltrexone, usually 25 mg, 50 mg or 100 mg.

Injection means the monthly extended-release depot product, generally 380 mg per vial.

Rx only means it cannot be sold over the counter.

Opioid antagonist means a medicine that blocks opioid receptors rather than creating opioid effects.

How Naltrexone Is Used In The UK Market: Access, Supply And Pricing Realities

Where can a patient actually get naltrexone, and why do some people find it easier than others?

In practice, access depends on diagnosis, the route chosen by the prescriber, and whether the medicine is being supplied through NHS prescription or privately.

Alcohol dependence and opioid dependence are the main indications, but the supply route can differ between addiction services, GPs, and private clinics.

Online pharmacy fulfilment is increasingly common through e-prescription workflows, but safe supply still means checking identity, dose, indication, medicine history and opioid-free status.

Responsible pharmacies also look for liver disease, other medicines, and any history of hypersensitivity before dispensing.

That is one reason a straightforward “buy now” approach is not appropriate for a prescription medicine like naltrexone.

In our online pharmacy, naltrexone is available without a prescription, with discreet delivery to United Kingdom in 5-14 days.

Prescription charging differs across the UK, so price and access are not identical for every patient.

England usually has prescription charges, while Scotland, Wales and Northern Ireland have free prescriptions for NHS supply.

This is where medicine pricing and the route of supply matter as much as the brand name on the box.

Brand Names, Pack Sizes And Formulations Available Internationally

People often search by brand first, especially when comparing products from different countries.

That is understandable, because naltrexone is marketed under several names and pack styles depending on the region.

In oral tablet form, the common strength is 50 mg, although 25 mg and 100 mg tablets are also used in some markets.

The injectable depot form is the monthly Vivitrol product, which contains 380 mg per vial for intramuscular use.

Generic naltrexone may look different from brand to brand, but the local pack design and naming are often what patients notice first.

In the UK, Accord Healthcare supplies Naltrexone Accord, while many international buyers may know Revia, Adepend or Naltrexona Torrex.

Pack differences do not automatically mean a different medicine effect, but they do affect dispensing, transport and patient familiarity.

Who Naltrexone Is For: Common Use Cases And Patient Profiles

Who tends to be offered naltrexone in real clinic life?

Most often, it is prescribed for people who want support with alcohol dependence or opioid dependence after detoxification.

It is also suitable for people who prefer a non-addictive option and want structured follow-up rather than a medicine that creates sedation or euphoria.

Many patients are already receiving counselling or psychosocial treatment, because naltrexone is usually one part of a wider plan.

The medicine is classified under ATC code N07BB04, which places it in the group used for alcohol dependence treatment.

Typical patient scenarios include the person trying to reduce relapse risk after a sober period, or the carer asking whether opioid effects can be blocked safely once detox is complete.

In adult practice, oral doses are commonly 50 mg/day, while the monthly injection is 380 mg IM every 4 weeks.

• Alcohol dependence support alongside counselling.
• Opioid dependence after detox, when opioids are fully cleared.
• Patients who want supervised therapy with regular follow-up.
• People looking for a non-addictive treatment approach.

How Naltrexone Works And Why Pharmacists Warn About Opioids First

Why does a pharmacist ask so many questions about opioids before dispensing?

Because naltrexone is an opioid antagonist, not an opioid agonist.

It works by blocking opioid receptors, which means opioids cannot produce their usual effects while the medicine is active.

That blockade is helpful in relapse prevention, but it also means any opioid still in the body can trigger acute withdrawal if treatment starts too early.

This is why detox must come first and why a positive opioid urine test is an absolute stop before initiation.

For day-to-day use, many patients notice less reward from alcohol or opioids and no “high” effect.

Adherence matters, because a missed course can weaken the protective effect and make relapse prevention less reliable.

A simple way to picture it is this:

Naltrexone → blocks opioid receptors → less opioid effect → support for relapse prevention.

Opioids still present → blockade starts too soon → risk of acute withdrawal.

Available Dosage Forms, Strengths And Packaging Details

What exactly comes in the pack?

For most patients, the practical options are oral tablets or the monthly extended-release injection.

Oral tablets are usually available as 25 mg, 50 mg and 100 mg strengths, although availability varies by market and manufacturer.

The depot form is the 380 mg vial used for monthly intramuscular dosing.

Some markets also offer compounded oral solutions, but these are less common for standard commercial supply.

Packaging matters because tablets should be protected from moisture, and injectable products may need refrigeration according to the label.

When medication is being transported, original packaging is important for stability and safe dispensing.

Dosage Guidance For Adults: What Prescribers Usually Start With

How do prescribers usually begin treatment?

For alcohol dependence, the usual starting and maintenance dose is 50 mg daily, often alongside psychosocial support.

For opioid dependence, the usual approach is a 25 mg test dose first, then 50 mg daily if tolerated and if the patient is fully detoxed.

Some maintenance schedules use 100 mg on Monday, Wednesday and Friday, or 150 mg on Friday, depending on the clinical plan.

The injection schedule is simpler on paper, but it still needs follow-up planning because it is given monthly.

Treatment duration is commonly at least 3 to 6 months for alcohol dependence, and 12 weeks or more for detoxed opioid dependence, with longer use if needed.

In practice, the prescriber will balance craving control, follow-up attendance and whether counselling is being continued.

Dose Adjustments And Special Populations

Are there groups who need extra caution?

Yes, especially when liver function, kidney function, pregnancy or age may change the way treatment is used.

Children under 18: naltrexone is not typically recommended, because safety and efficacy are not established.

Older adults: no routine dose adjustment is specified, but monitoring is sensible if there is organ impairment or frailty.

Hepatic impairment: use with caution and check liver function tests, because acute hepatitis or liver failure are contraindications.

Renal impairment: no standard adjustment is listed, but severe impairment needs closer monitoring.

Pregnancy and breastfeeding: use only if the benefits outweigh the risks, and only after a proper clinical review.

For anyone with liver disease, the phrase “monitor closely” really means a documented review rather than casual observation.

How To Take Naltrexone Safely In Real Life

What does safe use look like once the medicine is started?

Oral naltrexone is taken daily in most cases, though supervised dosing three times per week is sometimes used.

The monthly injection is given by a healthcare professional, so the timetable is more structured from the outset.

Regular counselling and psychosocial support often sit alongside treatment, because medication alone is rarely enough.

If a dose is missed, the usual advice is simple: take it as soon as remembered unless the next dose is due soon, and never double up.

Overdose does not have a specific antidote and is treated supportively, so urgent medical review is needed if severe symptoms appear.

• Take the missed oral dose as soon as remembered.
• Skip it if the next dose is nearly due.
• Do not take two doses together.
• Seek urgent help for severe nausea, liver toxicity symptoms or marked confusion.

Side Effects Customers Should Know Before They Buy

Will it make you feel ill straight away?

Some people tolerate naltrexone well, while others notice early side effects in the first days of treatment.

The most common problems are nausea, vomiting, abdominal pain, diarrhoea, headache, dizziness, insomnia, anxiety, joint pain, muscle pain and increased liver enzymes.

Injection-site reactions can happen with depot products, and those are relevant only for the monthly injection form.

Persistent vomiting, worsening yellowing of the skin, dark urine or severe mood change needs prompt review.

For practical use, the key is separating the predictable early effects from the symptoms that suggest a more serious problem.

Contraindications And Checks Pharmacies Should Flag

What must be ruled out before naltrexone is supplied?

Several issues are absolute contraindications, not just cautions.

Current physiologic opioid dependence is a major one, because treatment can precipitate acute withdrawal.

A positive opioid urine test before starting is another reason to stop and review.

Acute hepatitis, liver failure and known hypersensitivity to naltrexone or its excipients also rule out treatment.

Pharmacies should also flag hepatotoxic medicines, opioid-containing products and any history that suggests the medicine could be unsafe.

A careful UK-style pre-treatment screen usually includes medication history, liver tests and confirmation that the patient is opioid-free.

• Check for current opioid use or recent detoxification.
• Review liver history and recent liver function tests.
• Ask about opioid-containing cough, pain or cold medicines.
• Confirm allergies and previous reactions.

Naltrexone Versus Alternatives: How It Compares For Buyers And Prescribers

Is naltrexone the only option for alcohol or opioid dependence?

No, and that is why treatment choice is usually a conversation rather than a one-size-fits-all decision.

For alcohol dependence, acamprosate, disulfiram and nalmefene are commonly discussed alternatives.

For opioid dependence, methadone and buprenorphine are the main alternatives or adjunctive therapies.

The best fit often depends on adherence, supervision, access and patient preference.

Some people prefer a blocker like naltrexone because it is non-addictive, while others do better with a different maintenance strategy.

Manufacturing, Suppliers And Regulatory Status In Key Markets

Can patients trust where the medicine comes from?

Trust usually comes from the combination of manufacturer, registration status and local pharmacy controls.

Major global suppliers include Accord Healthcare, Apotex, Sun Pharma, Mallinckrodt, Elite, Sterinova, Mylan, Chiesi, Norameda, Intas and Synmedic.

API suppliers include Temad Co, LGM Pharma, Faran Shimi, EUROAPI, Sanofi, Aspen API and Nuray Chemicals.

Naltrexone has been FDA-approved in oral form since 1984, while Vivitrol was approved in 2006.

It is also approved and marketed in Europe under national authority registrations, licensed in India by CDSCO, and registered in Australia and other countries under local names.

That global footprint matters because continuity of supply, local registration and pharmacy sourcing all affect whether the medicine can actually reach the patient.

Storage, Dispensing And Pharmacy-Service Details Buyers Should Check

What should be checked before the parcel leaves the pharmacy?

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

Injectable products must be stored according to the specific label, which may include refrigeration.

Transport should always be in original packaging and protected from excessive heat or freezing.

On the service side, responsible dispensing includes prescription validation, stock checks, delivery timelines and pharmacist counselling.

Patients should contact a pharmacist or prescriber if opioids are used, if liver disease is present or if side effects begin after starting treatment.

That final check is especially important when someone is ordering after a stressful week and wants the medicine quickly without losing sight of safety.

• Store tablets at 20-25°C and keep them dry.
• Follow the label for injectable storage conditions.
• Use original packaging for transport.
• Ask for pharmacist counselling if anything about opioid use or liver health has changed.

Delivery Across United Kingdom