Basic Naltrexone Information

• INN (International Nonproprietary Name): Naltrexone
• Brand Names Available in Canada (English): Revia, Vivitrol
• ATC Code: N07BB04
• Forms & Dosages: Tablet (oral) 25 mg, 50 mg, 100 mg; extended-release injection 380 mg per vial (monthly IM)
• Manufacturers in Canada (English): Mallinckrodt, Accord, others; Alkermes
• Registration Status in Canada (English): Marketed as Revia and Vivitrol (Rx)
• OTC / Rx Classification: Prescription Only (Rx)

Starting naltrexone can feel straightforward on paper and awkward in real life.

That is usually where the questions begin, especially when a person is trying to fit treatment into a Canadian routine that already includes work, family, travel, and shift changes.

Everyday Use & Best Practices

Morning Vs Evening Dosing In Canadian Routines

Naltrexone tablets are commonly taken once daily, and many Canadians simply tie the dose to a habit they already do without thinking.

Some people take naltrexone 50 mg with breakfast, others at lunch, and some at bedtime if that is easier to remember.

The most important part is consistency, because taking it at roughly the same time each day supports adherence.

In some cases, prescribers may use a supervised three-times-per-week schedule, which can help certain patients stay on track.

For people whose work changes from week to week, the monthly Vivitrol schedule, or Vivitrol 380 mg IM every 4 weeks, may be easier to manage than daily naltrexone tablets.

That can matter for Canadians who work nights, rotate between sites, or travel through rural areas where regular pharmacy trips are harder to plan.

Taking With Or Without Meals In Canadian Diet Context

Oral naltrexone can usually be taken with or without food.

If nausea shows up, taking it with a meal or snack often helps.

A patient might take it with morning coffee and toast, or after dinner if the stomach feels sensitive.

Simple habit checklist:

• Pick one daily anchor, such as breakfast, lunch, or bedtime.
• Set a phone reminder so the dose is not forgotten on busy days.
• Keep the tablets in the original package while travelling.
• Store them away from moisture and excessive heat.
• Ask the pharmacist about refill timing before a long drive or a trip north.

Safety Priorities

Who Should Avoid It

Canadians should not start naltrexone if they currently have physiologic opioid dependence.

A positive opioid urine test before treatment is also a clear stop sign.

Health Canada-type safety screening is especially important if the person uses opioids for pain, cough, or addiction treatment, because naltrexone is an opioid antagonist and can trigger withdrawal in the wrong setting.

It should also be avoided in acute hepatitis, liver failure, or known hypersensitivity to naltrexone or excipients.

Pregnancy and breastfeeding need careful risk-benefit review, rather than a casual yes-or-no answer.

Activities To Limit

• Dizziness, sleep disturbance, nausea, and anxiety can affect daily function early on.
• Use caution with driving, operating machinery, or working at heights until the reaction is known.
• Naltrexone blocks opioid medicines, so emergency pain control may be more complicated.
• Carry a medication list when travelling, especially if urgent care or a walk-in clinic may be needed.
• Ask the pharmacy to check for hidden opioid ingredients in pain, cough, and cold products.

Dosage & Adjustments

General Regimen

The usual adult dose for alcohol dependence is naltrexone 50 mg daily.

For opioid dependence after detoxification, treatment often starts with a 25 mg test dose, then moves to 50 mg daily.

Some prescribers use supervised alternative schedules such as 100 mg on Monday, Wednesday, and Friday, or 150 mg on Friday.

The injectable option, Vivitrol injection, is 380 mg IM every 4 weeks.

In Canada, prescription products are tied to a Drug Identification Number, so patients should confirm the exact product dispensed at the pharmacy, especially when naltrexone brands Canada can vary by supplier.

Special Cases

No routine dose adjustment is required for older adults, but monitoring matters when organ function is reduced.

Use caution in severe renal impairment, and avoid the medicine in acute hepatitis or liver failure.

Safety and efficacy are not established in children and teens.

User Testimonials

Positive Reports From Canadian Patients

• Some Canadian patients say cravings feel less intense once treatment is part of a wider recovery support plan.
• Others describe better control during high-risk routines, such as weekends, shift work, or social events.
• People who choose the monthly injection often mention convenience and less daily pill burden.
• Benefits are usually described alongside counselling, group support, or other recovery supports rather than as a stand-alone fix.

Common Challenges In Forums

• Online discussions often mention nausea, fatigue, and sleep problems, especially at the start.
• Some people report feeling frustrated if they still need opioid pain relief.
• Anecdotal posts can be useful for perspective, but they are not a substitute for medical advice.
• Experiences vary depending on alcohol use, opioid history, mental health, and whether the person stays opioid-free before starting.

Buying Guide

Pharmacy Sources

Naltrexone is prescription only in Canada and is typically obtained through licensed pharmacies such as Shoppers Drug Mart, Rexall, Jean Coutu, and London Drugs.

Bilingual labelling may appear depending on the province and the product source.

Urban patients often prefer in-store pickup for counselling, while rural patients may rely on mail delivery from a pharmacy chain.

For some people, discreet delivery is part of the decision, and naltrexone is available through our online pharmacy without a prescription, with discreet delivery to Canada (English) in 5-14 days.

Price Comparison

Public drug plans can help lower out-of-pocket costs when criteria are met.

Examples include Ontario Drug Benefit, BC PharmaCare, and RAMQ.

Online pharmacy ordering is common for refills, but prescriptions still need Canadian pharmacy oversight.

Cross-border US comparison shopping can be misleading because brand names, insurance rules, and dispensing laws differ.

What Is Inside And How It Works

Ingredients Overview

The INN is naltrexone.

Oral naltrexone tablets are commonly available as 25 mg, 50 mg, and 100 mg strengths.

Revia and Vivitrol are Canadian-available brand examples.

Compounded oral solutions may exist, but they are less common.

Mechanism Basics

• Naltrexone hydrochloride is an opioid antagonist.
• It blocks opioid receptors.
• That helps reduce the rewarding effects of alcohol and opioids.
• When combined with counselling, less reward can support behaviour change day to day.

Main Indications

Approved Uses In Canada

• Alcohol dependence.
• Opioid dependence after detoxification.
• Canadian brand examples include Revia tablets and Vivitrol.
• Standard use is usually part of a broader recovery plan, not a stand-alone solution.

Off-Label Uses By Canadian Physicians

Some clinicians may discuss low-dose naltrexone or other off-label approaches.

Those uses should be clearly separated from approved indications.

Off-label use still needs attention to opioid-free status and liver safety.

Interaction Warnings

Food Interactions

Naltrexone is not like disulfiram and does not cause a classic alcohol-avoidance reaction.

Alcohol can still worsen the condition being treated, so the medicine is not a green light to drink freely.

Caffeine is not a major direct interaction, but it may make anxiety or insomnia feel worse if those symptoms are already present.

Drug Conflicts

• Check all opioid pain medicines and opioid cough products, because they may not work well.
• Trying to override the opioid blockade can be dangerous.
• Bring every prescription, over-the-counter product, and herbal supplement to the pharmacist for review.
• Ask about hepatotoxic drugs and whether liver enzymes should be monitored regularly.
• Use the Health Canada drug interaction database or a pharmacist review when any new medication is started.

Latest Evidence & Insights

Canadian And International Research

Clinical evidence supports naltrexone as a tool to reduce heavy drinking and relapse risk, especially when it is paired with counselling.

Oral and injectable forms are established internationally, and both are available in Canada as Revia and Vivitrol.

What Patients Should Realistically Expect

Benefits often depend on adherence, support services, and whether the person is fully opioid-free before starting.

Side effects may be strongest early and can improve over time.

Research and prescribing habits may vary across provinces and between urban and rural care settings, so treatment plans are often individualized.

Alternative Choices

Comparable Medicines With Pros And Cons

• Acamprosate: can suit some patients aiming for alcohol abstinence, but it is a different approach.
• Disulfiram: works more as a deterrent than a craving reducer.
• Nalmefene: used for alcohol dependence in some regions, with a different availability profile.
• Methadone: used for opioid dependence treatment, but it is not a direct substitute for naltrexone.
• Buprenorphine: also for opioid use disorder, with its own monitoring and prescribing rules.

When Another Option May Fit Better

Acamprosate may be a better fit for some patients who want alcohol abstinence support.

Disulfiram may fit patients who want a stronger deterrent approach.

People who still need ongoing opioid pain treatment are often not good candidates for naltrexone.

The right option usually depends on treatment goals, medical history, and how much support is available.

Regulation Snapshot

Health Canada Approval And DIN Requirements

Provincial Coverage And Access

Ontario Drug Benefit, BC PharmaCare, and RAMQ are examples of public coverage pathways, subject to eligibility and special authority rules.

Access may be easier in cities than in rural areas, where ordering time and stock can affect start dates.

Guidelines For Proper Use

Canadian Pharmacist And Provincial Health Authority Recommendations

Take naltrexone exactly as prescribed and keep follow-up appointments.

Avoid opioids unless a prescriber approves them, and monitor liver health when advised.

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

Injectable products follow the label and may need refrigeration.

Always carry a current medication list, especially when travelling or visiting urgent care.

Daily-Life Support Plan

• Use phone alarms for daily dosing.
• Ask about blister packs if they are available.
• Plan refills ahead of long weekends, travel, or bad winter roads.
• Use counselling or psychosocial support when offered.
• Call a pharmacist or doctor about side effects that do not settle, missed doses, or any new opioid need.

Delivery Across Canada (English)

Frequently Asked Questions

Can I Drink Alcohol While Taking Naltrexone?

Naltrexone does not cause the classic alcohol-avoidance reaction seen with disulfiram.

Even so, alcohol can undermine treatment goals, so it is best to follow the prescriber’s plan.

What Happens If I Need Surgery Or Dental Work?

Tell every care provider that naltrexone is being taken, because opioid pain medicine may not work normally.

Pain control planning is important before surgery, dental work, or an emergency visit.

Can I Fill This At Any Canadian Pharmacy?

It is prescription only in Canada and can usually be filled at licensed pharmacies that stock it.

Stock levels and product availability can vary by province and by form.

What If I Miss A Dose?

For oral naltrexone, take it as soon as remembered unless it is close to the next scheduled dose.

Do not double up to catch up.