Basic Prochlorperazine Information

• INN (International Nonproprietary Name): Prochlorperazine.
• Brand Names Available In Canada (English): Compazine and various generics are listed; Compazine has historical availability in Canada.
• ATC Code: N05AB04.
• Forms & Dosages: Tablets 5 mg and 10 mg (rarely 25 mg); suppositories 25 mg; injectable ampoules/vials 5 mg/mL and 12.5 mg/mL for IM/IV use; oral solution/syrup 5 mg/5 mL.
• Manufacturers In Canada (English): not specified.
• Registration Status In Canada (English): Registered across major markets as prescription-only medicine; specific Canadian Market Authorizations not specified in provided data.
• OTC / Rx Classification: Prescription Only (Rx) in major jurisdictions.

Read your prescription label and provincial drug plan coverage.

Drug Identification Numbers (DIN) and reimbursement rules vary by province, so confirm the DIN on the package and provincial formulary before submitting a claim.

Keep the original packaging and the patient leaflet for reference and any adverse-reaction reporting.

If you are pregnant, breastfeeding, elderly, or taking multiple medicines, check with your pharmacist or prescriber before starting prochlorperazine.

Warning signs To Stop And Seek Care: severe muscle stiffness, high fever, very slow or very fast heartbeat, fainting, uncontrollable restlessness, or allergic reaction such as rash, swelling, or breathing difficulty.

Practical Daily-Life Tip: carry a wallet card listing “prochlorperazine” (brand names: Compazine, Stemetil, generics) and your prescriber details for emergency visits.

Pharmacists at Shoppers Drug Mart, Rexall, London Drugs or Jean Coutu can provide immediate counselling and help with provincial coverage questions.

Checklist — What To Tell Clinicians:

• Allergies or past reactions to phenothiazines or other medicines.
• Pregnancy or breastfeeding status.
• All other drugs you take, prescription, OTC and herbal supplements.
• Alcohol use and any regular sedative or recreational substances.
• History of Parkinson’s disease, extrapyramidal symptoms, or seizures.

Everyday Use & Best Practices

Morning Vs Evening Dosing In Canadian Routines

Most short-course antiemetic regimens use 5–10 mg orally three to four times daily for adults.

Intramuscular or IV options in hospital settings may be given once or twice daily depending on clinical need.

Fit doses into regular daily anchors such as after waking, with the midday meal, late afternoon, and at bedtime.

For shift-workers or variable schedules, aim for consistent 6–8 hour spacing between doses.

Dosing for psychosis or severe anxiety is more frequent and must be titrated by a specialist according to product monographs.

Taking With Or Without Meals (Canadian Diet Context)

Prochlorperazine may be taken with or without food.

If nausea is linked to meals, try taking the tablet just after a small snack to reduce stomach upset.

Heavier breakfasts common in some Canadian households, for example meat and eggs, may increase morning sedation—monitor how you feel before driving.

If tablets irritate the throat or stomach, take with a sip of milk or water, or use the oral solution 5 mg/5 mL if swallowing is difficult.

Dosing Anchors:

• After waking (first dose).
• With midday meal (second dose).
• Late afternoon (third dose).
• At bedtime (fourth dose if prescribed).

Safety Priorities

Who Should Avoid It (Health Canada Advisories)

Do not use prochlorperazine in patients with a known hypersensitivity to phenothiazines.

Avoid in comatose patients or anyone with severe central nervous system depression.

Children under two years of age or under 10 kg should not receive oral prochlorperazine unless a specialist authorizes it.

Use caution in the elderly, particularly those with dementia-related psychosis, because of an increased mortality risk.

Avoid in patients with severe bone marrow depression, untreated Parkinson’s disease, or a history of neuroleptic malignant syndrome.

Activities To Limit (Driving, Workplace Safety)

Prochlorperazine commonly causes drowsiness, dizziness and blurred vision.

Avoid driving, operating heavy machinery, or safety-sensitive work until you know how the medicine affects you.

Alcohol and other sedatives increase these effects and should be avoided.

Inform occupational health or your employer if sedation affects your duties.

Contraindications Checklist:

• Known hypersensitivity to prochlorperazine or phenothiazines.
• Severe CNS depression or coma.
• Children under 2 years or <10 kg without specialist approval.
• Severe bone marrow depression or neuroleptic malignant syndrome history.

Dosage & Adjustments

General Regimen (DIN References)

Typical adult dosing for severe nausea and vomiting is 5–10 mg orally three to four times daily.

Short courses are generally used, often less than seven days for acute nausea.

Poor absorption or persistent vomiting are reasons to use suppository or IM/IV formulations, which are available as 5 mg/mL and 12.5 mg/mL injectables in hospitals.

Pediatric dosing is weight-based and approximated at 0.13 mg/kg every 6–8 hours, with specific age-based guidance on product monographs.

In Canada, prescriptions include a DIN on the package; confirm the DIN when checking provincial formulary coverage or pharmacy claims.

Special Cases (Elderly, Comorbidities)

Use the minimum effective dose in elderly patients and titrate slowly while monitoring for extrapyramidal symptoms and orthostatic hypotension.

Reduce dose in liver or kidney impairment due to reduced clearance and closer monitoring for adverse effects.

Use caution in patients with epilepsy because prochlorperazine can lower the seizure threshold.

Avoid use in very young children under two years or those under 10 kg unless a specialist approves.

Adjustment Triggers Checklist:

• Advanced age or frailty.
• Significant liver or renal impairment.
• History of seizures.
• Concurrent medications affecting CNS or cardiac conduction.

User Testimonials

Positive Reports From Canadian Patients

Many Canadians report fast relief from acute nausea such as post-operative nausea, migraine-related nausea, or gastroenteritis.

Users often note the suppository option is useful when oral fluids cannot be tolerated.

Emergency department patients frequently praise the rapid effect of IM/IV doses for severe vomiting.

Generics are commonly mentioned as low cost and widely available at chains like Shoppers and Rexall.

Several users describe sedation as a manageable trade-off for quick symptom control.

Common Challenges In Forums

Complaints commonly include drowsiness that impacts work or parenting responsibilities.

Some users report extrapyramidal reactions such as acute dystonia or akathisia, dry mouth, and orthostatic dizziness.

Rural patients mention occasional patchy availability of suppositories or injectables and confusion over brand names like Compazine versus generics or Stemetil.

Pros:

• Rapid relief for acute nausea.
• Multiple formulations available for different settings.
• Low cost generics.

Cons:

• Drowsiness and other anticholinergic effects.
• Risk of extrapyramidal symptoms in some patients.
• Variable availability in smaller communities.

Buying Guide

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

Prochlorperazine is prescription-only in Canada, and most national chains will stock generics and fill a valid prescription immediately.

Smaller rural pharmacies may need to order injectables or suppositories—call ahead to confirm stock.

Pharmacy counselling is standard and staff can provide dosing cards, bilingual labels where required, and storage instructions.

Some chains provide bilingual patient leaflets in Quebec and federally mandated bilingual packaging guidance.

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

Generics are typically low cost and many provincial formularies may cover certain indications; confirm coverage with your provincial drug plan such as Ontario Drug Benefit, BC PharmaCare, or RAMQ.

Online pharmacies sometimes offer lower prices but verify Canadian licensure and ensure a valid prescription is required.

Cross-border shoppers note brand availability differences—Compazine has been discontinued in some countries while generics remain broadly available.

Checklist — What To Bring When Filling A Prescription:

• Valid photo ID and health card.
• Current medication list including OTC and herbal products.
• Prescriber contact information for prior authorization questions.

Note: In our online pharmacy, prochlorperazine is available without a prescription, with discreet delivery to Canada (English) in 5-14 days.

What’s Inside & How It Works

Ingredients Overview

The active ingredient is prochlorperazine, a phenothiazine-class medication.

Dosage forms include tablets (5 mg, 10 mg), suppositories (25 mg), injectable ampoules/vials (5 mg/mL, 12.5 mg/mL), and oral solution (5 mg/5 mL).

Excipients vary by manufacturer; check the product monograph or package insert if you have allergies to dyes, lactose or preservatives.

Mechanism Basics

Prochlorperazine blocks dopamine D2 receptors in the chemoreceptor trigger zone and central pathways, reducing nausea and vomiting.

At higher doses the D2 blockade contributes to antipsychotic effects.

ATC classification is N05AB04, phenothiazines with a piperazine structure.

Anticholinergic effects and extrapyramidal symptoms arise from the drug’s dopamine and cholinergic receptor activity balance.

• Tablet → 5 mg/10 mg → outpatient nausea relief.
• Suppository → 25 mg → when oral dosing fails due to vomiting.
• Injectable (IM/IV) → 5 mg/mL, 12.5 mg/mL → emergency control in ED or inpatient settings.
• Oral solution → 5 mg/5 mL → swallowing difficulties or paediatric dosing.

Main Indications

Approved Uses In Canada

Prochlorperazine is commonly prescribed for severe nausea and vomiting in short courses.

Intramuscular and IV formulations are used in emergency departments and hospitals for acute control when rapid effect is required.

Historically, it has also been used for psychosis and severe anxiety in controlled clinical settings under specialist supervision.

Product monographs and the DIN product page list specific approved indications—confirm on the package or with provincial formularies.

Off-Label Uses By Canadian Physicians

Off-label uses may include migraine-associated nausea, severe refractory hiccups, and palliative care symptom control when other agents are unsuitable.

Physicians may use it in emergency protocols for agitation or vomiting if benefits outweigh risks, with documentation and monitoring.

Off-label prescribing should include informed consent and clear monitoring plans for extrapyramidal effects and cardiac risk.

Checklist For Off-Label Use:

• Document indication and informed consent.
• Discuss alternative therapies and monitoring plan.
• Review drug interactions and comorbidities before prescribing.

Interaction Warnings

Food Interactions (Alcohol, Caffeine)

Avoid alcohol while taking prochlorperazine because it increases sedation and hypotension.

Caffeine can mask sedation but may worsen jitteriness; it does not have a major metabolic interaction with prochlorperazine.

No major food-drug interactions are specified, but heavy meals may alter the timing of onset in practice.

Drug Conflicts (Health Canada Database)

Taking prochlorperazine with opioids, benzodiazepines or other CNS depressants increases risk of respiratory depression and sedation.

Anticholinergic burden increases when combined with tricyclic antidepressants or antimuscarinic agents.

Dopamine agonists such as levodopa are antagonized by prochlorperazine.

Concomitant use with QT-prolonging drugs increases cardiac risk and requires ECG monitoring where appropriate.

Anticonvulsant levels and seizure threshold may be affected, so consult a pharmacist for specific checks against your medication list.

Tell Your Pharmacist If You Take…

• Opioids, benzodiazepines, or other sedatives.
• Tricyclic antidepressants or strong anticholinergic drugs.
• Levodopa or other dopamine agonists.
• Any medications known to prolong the QT interval.
• Anticonvulsants or a history of seizures.

Latest Evidence & Insights

Current clinical guidance often prefers ondansetron for chemotherapy- or postoperative-induced nausea because of a favourable side-effect profile compared with phenothiazines.

Prochlorperazine remains a useful, low-cost antiemetic in emergency and resource-limited settings and for certain off-label uses supported by local ED protocols.

High-quality randomized trial data for several off-label uses is limited, so practice relies on clinical experience and institutional guidelines.

Safety monitoring focuses on extrapyramidal symptoms, cardiac risk in polypharmacy, and special care in elderly patients.

Takeaway for patients and clinicians: prochlorperazine is an effective, economical option when newer agents are not available or suitable, but requires monitoring for neurological and cardiac side effects.

Alternative Choices

Choosing an antiemetic depends on the cause of nausea, patient risk factors, cost and local formulary availability.

Ondansetron (Zofran):

• Pros: strong antiemetic effect, fewer extrapyramidal issues.
• Cons: higher cost and QT considerations.

Metoclopramide (Reglan/Primperan):

• Pros: prokinetic benefit for gastroparesis and simple nausea.
• Cons: risk of tardive dyskinesia with long-term use.

Promethazine (Phenergan):

• Pros: useful for motion sickness and allergy-related nausea.
• Cons: sedating with anticholinergic effects.

Haloperidol:

• Pros: used for refractory emesis or agitation in some ED protocols.
• Cons: EPS risk and cardiac effects similar to other antipsychotics.

Regulation Snapshot

Prochlorperazine is prescription-only in major jurisdictions and is classified under ATC code N05AB04.

In Canada, products dispensed should have a Drug Identification Number (DIN) on the packaging to confirm Health Canada registration.

Compazine exists historically in Canada though brand availability varies internationally and some markets have shifted to generics.

Provincial formularies such as Ontario Drug Benefit, BC PharmaCare and RAMQ differ in coverage and may require specific indications or prior authorization for reimbursement.

Hospitals typically stock injectable ampoules for ED use, while community pharmacies dispense oral and suppository forms with a prescription.

FAQ Section

Q: Is prochlorperazine covered by provincial drug plans?

A: Coverage varies by province and indication; check specific formulary listings and ask your pharmacist for help with prior authorization based on the DIN.

Q: Can I drink alcohol while taking prochlorperazine?

A: No; alcohol increases sedation and hypotension, so avoid until you know how you respond.

Q: What if I miss a dose?

A: Take it as soon as you remember unless it is nearly time for the next dose; do not double doses for short-course antiemetics.

Q: Are suppositories better if I am vomiting?

A: Yes; suppositories or IM/IV formulations bypass vomiting-related absorption issues and are commonly used in emergency settings when oral intake is not tolerated.

Quick Decision Flowchart — Vomiting And Unable To Keep Tablets:

1. If vomiting is occasional, try oral solution or small sips and retake tablets if retained.
2. If vomiting continues and you cannot keep oral medication, use a suppository if available or seek ED for IM/IV dosing.
3. If severe symptoms (dehydration, high fever, severe pain), proceed to emergency care.

Guidelines For Proper Use

Canadian Pharmacist And Provincial Health Authority Recommendations

Pharmacists should counsel on dosing schedules, recognition of side effects including extrapyramidal symptoms and hypotension, and interactions especially with CNS depressants.

Document allergies, pregnancy or breastfeeding status and concurrent medications in the patient profile before dispensing.

Report adverse reactions to Health Canada’s MedEffect program as per provincial guidance.

Adherence, Storage, And Disposal

Encourage adherence by aligning doses with daily routines and using blister packs or pharmacy multi-dose compliance aids where needed.

Store tablets and oral solution at room temperature between 15–30°C and protect from moisture and light.

Follow provincial sharps and medication handling policies for injectables in clinical settings.

Return unused tablets or suppositories to pharmacy take-back programs; do not flush medications down the toilet.

Pharmacist Counselling Checklist:

• Confirm indication, dose, and dosing times; align with meals if needed.
• Review all current medications and potential interactions.
• Advise on side effects to watch for and when to seek urgent care.
• Provide storage and disposal instructions and patient information leaflets.

Delivery Across Canada (English)