Basic Symmetrel Information

• INN (International Nonproprietary Name): Amantadine hydrochloride
• Brand Names Available In Canada (English): SYMMETREL — Tablets 100 mg; Syrup 50 mg/5 mL (brand listed for Canada in manufacturer data)
• ATC Code: N04BB — Amantadine (Adamantane derivative; Anti‑Parkinson drugs)
• Forms & Dosages: Tablets 100 mg; Standard capsules 100 mg; Syrup 50 mg/5 mL; Extended‑release formulations (68.5 mg, 129 mg, 137 mg) available in selective regions
• Manufacturers In Canada (English): Not specified in the provided product data; global/manufacturers listed include Endo Pharmaceuticals, Adamas Pharma (Gocovri), Osmotica (Osmolex ER), Merz Pharma, HEXAL, KRKA
• Registration Status In Canada (English): Product data lists SYMMETREL as marketed in Canada; specific Health Canada DIN entries are not specified — confirm DIN on the bottle or with the dispensing pharmacy
• OTC / Rx Classification: Prescription‑only (Rx) globally

Symmetrel (INN: amantadine hydrochloride) is prescription‑only in Canada; always check the label for a Health Canada Drug Identification Number (DIN) before purchase.

Keep all doses out of reach of children, and confirm syrup strength — where supplied it is 50 mg per 5 mL and tablets are commonly 100 mg.

If you have kidney disease, a seizure disorder, untreated angle‑closure glaucoma, heart failure, or a psychiatric history, speak with your prescriber because renal impairment requires dose reduction and some conditions may contraindicate use.

Don’t drive or operate heavy machinery until you know how Symmetrel affects you; dizziness, confusion, or hallucinations are possible side effects.

Carry a current medication list and your provincial health number (Ontario Drug Benefit, BC PharmaCare, RAMQ) when you visit pharmacies such as Shoppers Drug Mart, Rexall, London Drugs, or Jean Coutu.

Prefer keeping a wallet checklist with safety steps and emergency contacts listed for quick reference.

Everyday Use & Best Practices

Morning Vs Evening Dosing In Canadian Routines

Patients commonly start Symmetrel for Parkinson’s symptoms at 100 mg once daily and may increase to 100 mg twice daily if needed, with a maximum of 400 mg per day in divided doses.

For influenza A treatment the usual regimen is 100 mg twice daily for 5–7 days, begun within 48 hours of symptom onset.

If insomnia or agitation develops, take the larger or only dose early in the morning to reduce sleep disturbance.

If daytime drowsiness is the main problem, discuss moving doses later in the day with your prescriber, but avoid late‑night dosing if confusion is a risk.

Taking With Or Without Meals (Canadian Diet Context)

Amantadine may be taken with or without food, so timing can match typical Canadian meal patterns such as a higher‑protein breakfast or a fibre‑rich evening meal.

To reduce mild gastrointestinal upset, take tablets with food or after a meal, especially if your usual breakfast contains more fibre and protein.

Older adults or patients with renal impairment often benefit from smaller, split doses across the day to lower peak effects and reduce side effects.

Sample Day Schedules:

• Parkinson’s starter: 100 mg at breakfast (0800) — reassess in 2–4 weeks.
• Twice‑daily schedule: 100 mg morning (0800) and 100 mg early afternoon (1400) if tolerated.
• Antiviral course: 100 mg morning and 100 mg evening for 5–7 days, start within 48 hours of symptoms.

Safety Priorities

Who Should Avoid It (Health Canada Advisories)

Absolute contraindications include known allergy to amantadine or product excipients and untreated angle‑closure glaucoma.

Use with caution or avoid if you have a seizure disorder, severe renal impairment, congestive heart failure, or a significant psychiatric history including psychosis or hallucinations.

Pregnancy and breastfeeding are reasons for conservative use: therapy should be considered only if benefits outweigh risks and after discussion with an obstetrician or specialist.

Health Canada‑level guidance and product monographs tied to the DIN should be checked by prescribers and pharmacists before starting therapy.

Activities To Limit (Driving, Workplace Safety)

Until you know how Symmetrel affects you, avoid driving, cycling, or operating heavy machinery because amantadine can cause dizziness, drowsiness, blurred vision, or confusion.

Patients in safety‑sensitive jobs should discuss temporary work restrictions with their employer and clinician until tolerance is confirmed.

Older adults should watch for orthostatic hypotension and increased fall risk; perform position changes slowly and consider a home safety review.

Red‑Flag Medical History Checklist:

• Seizure disorder or history of convulsions.
• Psychosis, hallucinations, or severe psychiatric illness.
• Known severe renal impairment or dialysis.
• Untreated angle‑closure glaucoma.
• Congestive heart failure or uncontrolled cardiovascular disease.

Do Not Drive Checklist For New Starts:

• First 48–72 hours after starting or dose increase: avoid driving.
• If dizziness, sedation, or visual disturbance occurs: stop driving and seek advice.
• Report any new hallucinations or confusion to prescriber immediately.

Report serious adverse events to Health Canada’s MedEffect and notify your pharmacist or family physician promptly.

Dosage & Adjustments

General Regimen (DIN References)

For Parkinson’s disease the typical adult dose is 100 mg once to twice daily with cautious titration and a maximum of 400 mg per day in divided doses.

For influenza A treatment, the standard adult course is 100 mg twice daily for 5–7 days, started within 48 hours of symptom onset.

Children ≥10 years often use 100 mg twice daily, while under 10 years require specialist consultation and weight‑based dosing considerations.

Always check the DIN on the dispensing label and consult the DIN‑specific product monograph at the pharmacy for exact manufacturer dosing instructions.

Special Cases (Elderly, Comorbidities)

Renal impairment is the most important adjustment: reduce dose by approximately 50% or more depending on eGFR to avoid accumulation and toxicity.

Elderly patients should start at the lowest effective dose, such as 100 mg once daily, and increase slowly with close monitoring for CNS and cardiovascular effects.

Hepatic impairment requires vigilance though no standard adjustment is listed; monitor clinically and consider specialist input.

Signs of overdose include agitation, hallucinations, cardiac arrhythmia, convulsions, and severe hypotension — seek emergency care and consider dialysis for severe poisoning.

Contact your prescriber if you experience new confusion, urinary retention, or heart rhythm changes.

User Testimonials

Positive Reports From Canadian Patients

Many Canadian patients report reduced tremor or improved control of drug‑induced dyskinesia when amantadine is added to their Parkinson’s regimen.

Users often appreciate the convenience of 100 mg tablets and note affordability when covered by provincial drug plans.

When used for influenza A, some patients say earlier symptom relief occurred if treatment started within 48 hours.

Common Challenges In Forums (Reddit Canada, Health Boards)

Frequent complaints on forums include daytime drowsiness, vivid dreams, hallucinations, dry mouth, constipation, and livedo reticularis (skin mottling).

Rural patients sometimes report supply variability and fewer syrups in stock, while larger chains like Shoppers Drug Mart or London Drugs more reliably carry tablets.

Patients value clear counselling on renal dosing and prefer pharmacies that ask about kidney function and all current medications before dispensing.

• Thumbs Up: Improved motor control, simple tablet dosing, sometimes covered by provincial plans.
• Thumbs Down: Drowsiness, hallucinations, supply variability in small towns, limited syrup availability.

Checklist For Your Pharmacist Visit: current medication list, known kidney function (eGFR), provincial coverage card (ODB, BC PharmaCare, RAMQ), and any history of psychiatric illness or seizures.

Buying Guide

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

Symmetrel (amantadine hydrochloride) is prescription‑only and available through major Canadian chains including Shoppers Drug Mart, Rexall, London Drugs, and Jean Coutu, as well as hospital and some independent pharmacies.

Independent pharmacies may order generics if they do not routinely stock the product; always verify tablet strength and syrup availability with your pharmacist and confirm the DIN on the packaging.

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

In‑store prices vary by location and dispensing fees, while some licensed Canadian online pharmacies may list lower fees but require a valid prescription and verification of credentials.

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

Cross‑border purchasing and importation have restrictions — branded extended‑release products such as Gocovri and Osmolex ER have different approval statuses and US pricing that do not guarantee lawful import into Canada.

Before buying, ask your pharmacist to check provincial formulary coverage and any required prior authorization for brand or generic alternatives.

What’s Inside & How It Works

Ingredients Overview

The active ingredient is amantadine hydrochloride (INN) in standard Symmetrel formulations such as 100 mg tablets and 50 mg/5 mL syrup where available.

Excipients vary by manufacturer and are listed in the DIN‑specific product monograph; check labels for allergen information.

Extended‑release branded products (Gocovri, Osmolex ER) use different formulations and strengths and have distinct dosing and indication profiles.

• Active: Amantadine hydrochloride.
• Excipients: Vary — consult the product monograph on the pharmacy‑labelled DIN for details.

Mechanism Basics

Amantadine has two principal actions that explain its uses.

Antiviral activity: it historically inhibited influenza A viral uncoating, which is why it was used for flu treatment and prophylaxis in the past.

CNS effects: it modulates dopaminergic neurotransmission and can reduce excessive glutamatergic activity, offering symptomatic benefit in Parkinson’s disease and for some drug‑induced movement disorders.

ATC Classification: N04BB — amantadine in the dopaminergic agents group.

Clinical implication: motor benefits may appear within days, but central nervous system and cardiovascular adverse effects require monitoring during treatment initiation and dose changes.

Main Indications

Approved Uses In Canada

Licensed indications include Parkinson’s disease (idiopathic and secondary) and drug‑induced extrapyramidal symptoms, as well as historical use for influenza A treatment and prophylaxis depending on resistance patterns.

Confirm local approval and indications by checking the product monograph tied to the DIN at dispensing.

Off‑Label Uses By Canadian Physicians

Off‑label applications include treatment for post‑traumatic brain injury fatigue, certain fatigue syndromes including MS‑related fatigue, and adjunctive therapy for levodopa‑induced dyskinesia in selected patients.

Extended‑release amantadine products have specific dyskinesia evidence in international trials but availability and approval differ by country and brand.

Prescribers should document off‑label rationale and monitor outcomes as part of routine care.

Interaction Warnings

Food Interactions (Alcohol, Caffeine)

Alcohol may worsen drowsiness, dizziness, and orthostatic hypotension while starting or changing amantadine doses and should be limited.

Caffeine has no major documented interaction with amantadine, but it may exacerbate insomnia if used together due to CNS stimulation.

Drug Conflicts (Health Canada Database)

Check the Health Canada drug database and the DIN‑specific monograph for detailed interactions at the point of dispensing.

High‑risk drug classes include other CNS‑active agents (anticholinergics, antipsychotics, benzodiazepines) that may increase confusion or hallucinations.

Dopaminergic agents such as levodopa and dopamine agonists may have additive CNS effects and alter dyskinesia profiles.

Drugs that impair renal function or change renal clearance, including some diuretics, can increase amantadine levels and risk toxicity.

Sodium bicarbonate and alkalinizing agents may affect renal excretion; drugs that lower seizure threshold warrant caution.

Pharmacist Medication Review Checklist:

• List all CNS drugs, anticholinergics, and antipsychotics.
• Confirm renal function and diuretic use.
• Flag any seizure‑risk medications for prescriber consultation.

Latest Evidence & Insights

Highlight Canadian And International Research (Tables Recommended)

International trials support a modest benefit of amantadine for motor symptoms in Parkinson’s disease and for levodopa‑induced dyskinesia, particularly with extended‑release formulations in specific studies.

Antiviral use against influenza A has historical evidence but is limited by resistance patterns; public health guidance from the Public Health Agency of Canada should be consulted during each flu season.

Rehabilitation and neurotrauma studies show variable benefit for post‑traumatic brain injury fatigue and arousal, with evidence strength ranging from limited to moderate.

Practical Takeaways For Patients

Expect variable response and watch for CNS side effects; benefits for motor symptoms often appear within days to weeks.

Reassess therapy regularly and consult your pharmacist to pull the DIN‑specific product monograph for up‑to‑date safety and dosing information.

If you notice troubling side effects or no clinical benefit after a reasonable trial, speak with your prescriber about alternatives or dose adjustments.

Alternative Choices

List Of Comparable Medicines

Alternatives for Parkinson’s symptom control include levodopa/carbidopa, dopamine agonists (pramipexole, ropinirole), and MAO‑B inhibitors (selegiline, rasagiline).

For influenza A, rimantadine is a related adamantane with differing resistance profiles, although use is limited by current viral susceptibility.

For dyskinesia management, extended‑release amantadine formulations such as Gocovri have trial data in some regions and may be considered where available and approved.

Pros/Cons Checklist

Choice depends on symptom profile, age, renal function, comorbidities, and provincial formulary coverage; some alternatives require special authorization.

Regulation Snapshot

Health Canada Approval And DIN Requirements

Products sold in Canada should display a Health Canada Drug Identification Number (DIN) on the label, which links to the manufacturer’s product monograph and approved indications.

Health Canada evaluates safety, indications, and labelling; provincial drug plans such as Ontario Drug Benefit, BC PharmaCare, and RAMQ set coverage rules and may require prior authorization.

Prescription‑Only & Import Rules

Symmetrel and amantadine products are classified Rx rather than OTC in the product data and must be dispensed against a prescription.

Personal importation of prescription medications is restricted — check CBSA and Health Canada guidance before ordering from US or international vendors.

Pharmacies must follow federal and provincial dispensing regulations and should confirm DINs, manufacturer details, and bilingual labelling requirements where applicable.

• Verify DIN before purchase.
• Confirm whether an extended‑release brand is approved domestically or regionally.
• Keep a copy of your prescription and provincial coverage card for reimbursement.

FAQ Section

Can I Drive While Taking Symmetrel?

Not until you know how Symmetrel affects you.

If you experience dizziness, sedation, or visual disturbance, avoid driving and report effects to your prescriber.

What If I Miss A Dose / Am I Pregnant / How To Store?

If you miss a dose, take it as soon as you remember unless it’s almost time for the next dose; do not double the dose.

Pregnancy and breastfeeding: use only if the potential benefit justifies the potential risk; discuss risks and alternatives with your obstetrician or prescriber.

Store at room temperature between 15–30°C, protected from light and moisture; keep syrup tightly closed in the original container.

If you experience severe side effects, signs of overdose, or an allergic reaction, seek emergency care immediately and notify your pharmacist and prescriber.

Provincial Resources: contact Ontario Drug Benefit, BC PharmaCare, or RAMQ for coverage queries and reimbursement steps.

Guidelines For Proper Use

Canadian Pharmacist And Provincial Health Authority Recommendations

Pharmacists should confirm the DIN, counsel on tablet versus syrup dosing, and screen for renal impairment, psychiatric history, and drug interactions before dispensing.

Provide patients with written instructions, a pillbox or blister card, and a monitoring plan that matches provincial guidance and formularies.

Monitoring & Follow‑Up Plan

Baseline tests commonly include renal function (eGFR) and a medication review to screen interactions and seizure risk.

Monitor for CNS effects (mood changes, hallucinations), cardiovascular signs (orthostatic hypotension), skin changes (livedo reticularis), urinary retention, and cognitive impact in seniors.

Follow‑up timing: initial check within 2–4 weeks after starting or dose change, then every 3–6 months or sooner if concerns arise.

• Baseline: eGFR, medication list, psychiatric history.
• Early follow‑up: 2–4 weeks after initiation or titration.
• Ongoing: every 3–6 months or with new symptoms.

Provide a one‑page patient handout at dispensing with local provincial coverage notes (ODB, PharmaCare, RAMQ) and emergency contact steps.

Delivery Across Canada (English)

Closing Checklist

Quick Safety Reminders

Always confirm the DIN on the package and ask your pharmacist to check renal function before dispensing if not already documented.

Keep medications away from children and store at room temperature out of direct light and moisture.

Report serious adverse events to Health Canada’s MedEffect and keep a copy of your prescription and provincial drug plan card when filling.

When in doubt, treat forum advice as anecdotal and verify any changes with your pharmacist or prescriber.