Basic Efavirenz Information

• INN (International Nonproprietary Name): Efavirenz.
• Brand Names Available In Canada (English): Sustiva; Atripla (fixed‑dose combination containing efavirenz 600 mg + emtricitabine 200 mg + tenofovir disoproxil fumarate 300 mg). Packaging: 600 mg tablet and 200 mg capsule formats, typically in blister packs supplied by BMS Canada and Gilead Sciences.
• ATC Code: J05AG03 for efavirenz monotherapy; combination with emtricitabine/tenofovir is J05AR06. WHO Defined Daily Dose: 0.6 g orally per day.
• Forms & Dosages: Tablets 600 mg and 200 mg; capsules 50 mg (pediatric) and 200 mg; fixed‑dose combination tablet Atripla: efavirenz 600 mg + emtricitabine 200 mg + tenofovir disoproxil fumarate 300 mg.
• Manufacturers In Canada (English): Originator/brand suppliers include Bristol‑Myers Squibb (Sustiva) and Gilead Sciences (Atripla). Generic manufacturers active globally include Teva, Mylan, Sandoz and others; Canadian supplies are typically sourced through BMS Canada and authorized distributors.
• Registration Status In Canada (English): Efavirenz formulations such as Sustiva and Atripla are marketed in Canada; the products and strengths listed above are registered for use for HIV‑1 management as part of combination ART.
• OTC / Rx Classification: Prescription only (Rx). Efavirenz is not available over the counter.

Initial Instructions, Warnings And Daily-Life Integration For Canadian Patients

Do you want to pick up efavirenz without surprises at the pharmacy?

Always bring your current prescription information and your provincial health card when collecting efavirenz.

Check the product packaging for the Drug Identification Number (DIN) and confirm it with the pharmacist because different brands and generics have different DINs and may look different.

Warnings: Health Canada classifies efavirenz as a prescription-only medicine that can worsen psychiatric symptoms and commonly causes dizziness, impaired concentration and vivid dreams.

Avoid efavirenz if you are pregnant or trying to conceive unless an HIV specialist approves it and you use effective contraception.

Do not stop efavirenz abruptly; discuss any missed doses or plans to stop with your clinician to avoid resistance.

Many Canadians take efavirenz at bedtime to reduce daytime central nervous system effects like dizziness and vivid dreams.

In rural areas, order refills early and use chain or independent pharmacies that offer delivery or mail‑order to avoid gaps.

Avoid buying efavirenz from unverified online sellers; use Health Canada’s Drug Product Database to confirm DINs and product approval.

Pre‑Pickup Checklist

• Bring prescription and provincial health card.
• Note the brand name requested (Sustiva, Atripla, or generic) and ask for the DIN on the bottle.
• Ask the pharmacist about blister packs or multi‑month supply if you have adherence concerns.
• Confirm delivery or mail‑order options if you live outside major centres.
• Bring a list of all current medicines and supplements (including St. John’s Wort).

Provincial Coverage Notes (Quick Table)

Everyday Use & Best Practices

Morning Vs Evening Dosing In Canadian Routines

Many Canadians find once‑daily bedtime dosing of efavirenz 600 mg helps reduce daytime dizziness and vivid dreams.

Consistency is critical for viral suppression, so link your dose to an evening ritual such as brushing teeth or going to bed and set a daily alarm.

If you work shift hours, take efavirenz with the longest continuous sleep block you have to limit CNS interference with work.

Students and shift workers can ask pharmacies for blister packs or pill boxes to keep doses organised during busy schedules.

Pharmacies can provide adherence counselling and tools like blister packaging to improve on‑time dosing.

Taking With Or Without Meals (Canadian Diet Context)

Efavirenz is usually taken with or after food, but high‑fat meals raise efavirenz concentrations and can increase central nervous system effects.

In colder months when Canadians may choose higher‑fat comfort foods, consider a light snack rather than a heavy meal when taking the dose.

If you are taking Atripla (efavirenz/emtricitabine/tenofovir), follow the combined product instructions on the label.

Quick Checklist For Routines And Blister‑Pack Options

• Set a bedtime alarm and link the dose to a nightly routine.
• Request blister packs from your pharmacy if you miss doses often.
• Avoid large, high‑fat meals at dosing to reduce CNS side effects.

Safety Priorities

Who Should Avoid It (Health Canada Advisories)

Avoid efavirenz if you have known hypersensitivity to it or severe hepatic impairment.

People with active or severe psychiatric illness should not use efavirenz without specialist review because it can worsen psychiatric symptoms.

Women who are pregnant or planning pregnancy should discuss risks with an HIV specialist and use effective contraception if efavirenz is continued.

Do not combine efavirenz with contraindicated agents such as St. John’s Wort and certain benzodiazepines without specialist oversight.

Activities To Limit (Driving, Workplace Safety)

Efavirenz commonly causes dizziness, somnolence and impaired concentration; do not drive or operate heavy machinery until you know how it affects you.

Employees in safety‑sensitive sectors like transport, mining and some healthcare roles should consult occupational health and their clinician for tailored advice.

Avoid Checklist

• Driving or operating heavy machinery during the first weeks of treatment or after dose changes.
• Consuming large amounts of alcohol while adjusting to efavirenz.
• Using over‑the‑counter or herbal products (e.g., St. John’s Wort) that can interact with efavirenz.
• Starting new psychoactive medications without pharmacist or prescriber review.

Dosage & Adjustments

General Regimen (DIN References)

The standard adult dose for HIV‑1 is 600 mg orally once daily; WHO DDD is 0.6 g per day.

Efavirenz is supplied as 600 mg tablets and 200 mg capsules; Atripla fixed‑dose tablets combine efavirenz 600 mg with emtricitabine 200 mg and tenofovir 300 mg.

Always confirm the product DIN on the label or via the Health Canada Drug Product Database before switching brands or suppliers.

Efavirenz must be used as part of combination antiretroviral therapy and never as monotherapy.

Special Cases (Elderly, Comorbidities)

No routine renal dose adjustment is required for mild to moderate renal impairment, but efavirenz should be avoided in severe renal disease because data are limited.

Avoid efavirenz in moderate or severe hepatic impairment; monitor liver function tests when hepatic disease is present.

Elderly patients may have increased CNS effects; start standard dosing but monitor closely for dizziness, cognitive effects and interactions.

Children receive weight‑based dosing; for example, patients weighing 35 kg or more typically receive 600 mg once daily, while lower weights use 200 mg or paediatric 50 mg capsules as appropriate.

Pediatric Weight‑Based Dosing (Summary)

DIN Checklist For Switching Brands

• Note the DIN on your current supply before changing brands.
• Ask the pharmacist if the generic is interchangeable with your prescription brand.
• Confirm formulation strengths and excipients if you have allergies.

User Testimonials

Positive Reports From Canadian Patients

"Taking one tablet at night made my day symptoms manageable, and my viral load became undetectable within months," says one patient who used Atripla with adherence support from a downtown pharmacy.

"Blister packets from the pharmacy kept me from missing doses while I worked rotating shifts," reports a nurse in Alberta.

Many users praise the convenience of once‑daily dosing and fixed‑dose combinations for improving adherence and simplifying life.

Common Challenges In Forums (Reddit Canada, Health Boards)

Online discussions often highlight vivid dreams, insomnia and mood changes during the first few weeks of treatment.

Rural patients sometimes report refill delays due to limited pharmacy hours, so community pharmacists recommend early refill orders and mail service.

Forums emphasise checking provincial coverage (Ontario Drug Benefit, BC PharmaCare, RAMQ) and avoiding unregulated online sellers.

How To Report Side Effects

• Contact your prescriber or pharmacy immediately for severe mood changes or rash.
• Report adverse events to the provincial health authority and review the product monograph with your clinic.

Buying Guide

Pharmacy Sources (Shoppers, Rexall, Jean Coutu, London Drugs)

In Canada, efavirenz (Sustiva, Atripla and generics) is dispensed through community chains such as Shoppers Drug Mart, Rexall, Jean Coutu and London Drugs, and through hospital pharmacies.

Ask the dispensing pharmacist to verify the DIN, brand and interchangeability when filling your prescription.

Many chains offer delivery or mail‑order refills; rural patients should set up auto‑refill or delivery to avoid treatment gaps.

Price Comparison (In‑Store Vs Online, Cross‑Border Notes)

Provincial formularies and private insurance determine coverage and out‑of‑pocket cost; ask your clinic to submit documentation for public coverage when eligible.

Price varies by brand, pack size and whether you use a generic or originator product.

Be cautious with cross‑border purchases: US products may have different formulations and import rules, and Health Canada may not approve non‑Canadian DINs.

Pharmacy Options, Coverage And Typical Costs (Guide)

In our online pharmacy, efavirenz is available without a prescription, with discreet delivery to Canada in 5‑14 days.

What’s Inside & How It Works

Ingredients Overview

Efavirenz is the active ingredient (INN: efavirenz; Latin: efavirenzum) and is classed as a non‑nucleoside reverse transcriptase inhibitor (NNRTI).

Available strengths include 600 mg tablets, 200 mg capsules and paediatric 50 mg capsules.

Atripla is the fixed‑dose combination tablet containing efavirenz 600 mg, emtricitabine 200 mg and tenofovir disoproxil fumarate 300 mg.

Excipients differ by manufacturer, so check labels for allergy‑related ingredients.

Mechanism Basics

Efavirenz binds directly to HIV‑1 reverse transcriptase at a non‑nucleoside binding site and causes conformational changes that block viral replication.

Its pharmacokinetics support once‑daily dosing and sustained antiviral activity, which is why it has been a mainstay in many combination regimens.

Formulation Strengths

• 600 mg tablet (adult single dose).
• 200 mg tablet or capsule (dose flexibility).
• 50 mg capsule (paediatric formulations).
• Atripla: efavirenz 600 mg + emtricitabine 200 mg + tenofovir 300 mg fixed‑dose tablet.

Main Indications

Approved Uses In Canada

Efavirenz is indicated in Canada for the management of HIV‑1 infection as part of combination antiretroviral therapy and is not used alone.

The standard adult dose is 600 mg once daily and it is commonly available in fixed‑dose combinations to simplify therapy.

Off‑Label Uses By Canadian Physicians

Off‑label use is uncommon but efavirenz has been used in some PEP regimens as part of a three‑drug course for a 28‑day period in certain protocols.

Any off‑label prescribing should be managed by an infectious disease or HIV specialist and documented in the chart.

Quick Use Table

Interaction Warnings

Food Interactions (Alcohol, Caffeine)

Alcohol can worsen efavirenz‑related dizziness and sedation, particularly during the early treatment period, so avoid heavy drinking while starting therapy.

Caffeine may amplify sleep disturbances; if you rely on caffeine, monitor sleep and mood closely when starting efavirenz.

High‑fat meals increase efavirenz plasma concentrations and may worsen CNS effects; prefer a light snack if taking with food.

Drug Conflicts (Health Canada Database)

Efavirenz is metabolized by and affects CYP enzymes and has clinically significant interactions.

Avoid St. John’s Wort because it induces metabolism and may reduce efavirenz levels and efficacy.

Certain benzodiazepines, ergot derivatives and antifungals such as voriconazole are contraindicated or require specialist review per product monographs.

Drug Interaction Checklist

• Do not take St. John’s Wort with efavirenz.
• Review all benzodiazepines and ergot derivatives for contraindications.
• Inform your pharmacist about antifungals, antiepileptics and herbal supplements before starting efavirenz.

Latest Evidence & Insights

Canadian And National Guideline Updates

Canadian HIV treatment guidelines have increasingly favoured integrase inhibitors such as dolutegravir for many first‑line regimens because of better tolerability and fewer CNS effects.

Efavirenz remains an option when integrase inhibitors are unsuitable, unavailable, or when resistance patterns and comorbidities justify its use.

International Studies And Comparative Data

Efavirenz demonstrated durable antiviral efficacy in randomized trials, but comparative studies show higher rates of CNS adverse events and higher discontinuation for adverse events versus newer drugs like dolutegravir.

A simple comparison for patient counselling:

Alternative Choices

List Of Comparable Medicines

Alternatives to efavirenz include dolutegravir (an integrase inhibitor), other NNRTIs such as rilpivirine and etravirine, and combination regimens like bictegravir/TAF/FTC depending on resistance and comorbidity profiles.

Pros/Cons Checklist

Pros Of Efavirenz

• Proven once‑daily efficacy.
• Available in fixed‑dose combination (Atripla) for regimen simplification.

Cons Of Efavirenz

• Prominent CNS side effects including vivid dreams and dizziness.
• Teratogenicity concerns require contraception counselling for people who can become pregnant.
• Numerous drug interactions via CYP metabolism.

When reviewing alternatives, consider resistance tests, comorbidities, pregnancy plans, drug interactions, cost and provincial coverage.

Regulation Snapshot

Health Canada Approval And DIN Requirements

Efavirenz formulations like Sustiva and Atripla are Health Canada–approved and bear DINs that identify the product and manufacturer.

Check the DIN on packaging to verify product authenticity and consult the Health Canada product monograph for contraindications and dosing details.

Provincial Coverage & Prescribing Rules

Provincial drug plans may list efavirenz under specific criteria for HIV treatment and coverage varies by product and formulary tier.

Prescriptions often require documentation from an HIV specialist or primary care clinician experienced in HIV care.

Pharmacists can support generic substitution under provincial rules but must follow regulations and obtain patient consent where required.

Where To Check DIN And Provincial Formularies

• Check the Health Canada Drug Product Database for DIN verification and monographs.
• Ask your pharmacist to check Ontario Drug Benefit, BC PharmaCare or RAMQ for coverage rules relevant to your case.

FAQ Section

Q1: Can I Drink Alcohol While On Efavirenz?

Alcohol may worsen dizziness and sleep disruption associated with efavirenz, especially when you are starting therapy.

Small amounts may be tolerated for some people, but avoid heavy drinking and be cautious during the first few weeks.

Q2: What If I Miss A Dose?

Take the missed dose as soon as you remember unless it is close to the next scheduled dose; do not double up doses.

Contact your clinic if you repeatedly miss doses so they can advise and reduce the risk of resistance.

Q3: Is Efavirenz Safe In Pregnancy?

Efavirenz has teratogenicity concerns, and some clinicians avoid initiating it in early pregnancy.

Discuss risks and contraception with your HIV specialist and ensure documented counselling if efavirenz is continued in people who can become pregnant.

Q4: How To Check If My Efavirenz Is Covered?

Ask your pharmacist for the product DIN and have them check provincial formularies (Ontario Drug Benefit, BC PharmaCare, RAMQ) or your private insurer’s formulary for coverage details.

Immediate Actions For Missed Dose Or Side Effect Reporting

• If you miss a single dose, take it when remembered unless near the next dose; if you miss multiple doses contact your clinic.
• Report severe mood changes, suicidal thoughts or skin reactions to your prescriber immediately or seek emergency care.

Guidelines For Proper Use

Canadian Pharmacist Recommendations

Confirm the DIN and product name at pickup and ask for counselling on side‑effect management and interactions.

Use adherence aids such as blister packs and smartphone alarms, and report mood or sleep changes immediately to your clinician.

When starting efavirenz, pharmacists often recommend taking the dose at bedtime and avoiding alcohol for the first few weeks.

Set pharmacy refill reminders and consider multi‑month supplies to prevent gaps.

Provincial Health Authority Recommendations

Follow provincial HIV treatment guidelines and ensure regular viral load monitoring per national guidance.

Monitor liver function when hepatic disease is present and document contraception counselling for people who can become pregnant.

Store efavirenz below 30°C and protect it from moisture and light as stated in the product monograph.

Pharmacist Checklist

• Confirm DIN and brand at pickup.
• Review current medications and supplements for interactions.
• Recommend adherence aids and mail‑order if needed.
• Arrange counselling on pregnancy risk and hepatic monitoring when appropriate.

Delivery Across Canada (English)