Generic Phenergan ( Promethazine )

Buy Generic Phenergan (Promethazine) without prescription at Canadian Pharmacy

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What is Phenergan?

Phenergan is an antihistamine and antiemetic. The active ingredient is promethazine, a drug that blocks histamine and dopamine receptors, which is why it works for allergies, nausea, motion sickness, and as a sedative. It has been around for decades and is still used because it is effective and inexpensive. Phenergan treats allergic reactions like hives and hay fever, but it is most often prescribed for nausea and vomiting, especially after surgery, and for motion sickness. It is also used as a short-term sleep aid, though that is not its primary role. Unlike newer antihistamines, promethazine crosses the blood-brain barrier heavily, causing significant drowsiness. That sedation is sometimes the reason it is given, but it also means you must be careful about driving or operating machinery.

Phenergan comes in two common tablet strengths: 10 mg and 25 mg. The 10 mg dose is often used for milder symptoms or for children. The 25 mg dose is the standard adult dose for nausea, motion sickness, or sedation. It can be taken by mouth, as a suppository, or by injection in a hospital setting. The effect begins within 30 to 60 minutes after an oral dose and lasts 4 to 6 hours, sometimes longer. The 25 mg tablet is the workhorse for adults, while the 10 mg is useful for dose titration and for people who are very sensitive to the sedative effects. Phenergan is not a controlled substance, but it can be abused for its sedative effect, so it is generally prescription-only in Canada.

Mechanism and Pharmacology

Promethazine is a phenothiazine derivative, but it is not an antipsychotic like other phenothiazines. It is a potent antagonist at histamine H1 receptors, which accounts for its anti-allergy and sedative effects. It also blocks muscarinic acetylcholine receptors, causing dry mouth and blurred vision. Its antiemetic effect comes from blocking dopamine D2 receptors in the chemoreceptor trigger zone of the brain. The combination of antihistamine, anticholinergic, and antidopaminergic actions makes it effective for nausea from multiple causes, including motion sickness, vestibular disorders, and post-operative nausea. The strong H1 blockade is what makes it so sedating compared to second-generation antihistamines.

After oral administration, promethazine is well absorbed, with peak plasma levels reached in about 2 to 3 hours. It is extensively metabolized in the liver to several metabolites, including promethazine sulfoxide and desmethylpromethazine. The half-life is about 10 to 14 hours, but the clinical effects are shorter because the drug redistributes. It is excreted in the urine. In older adults, clearance is slower, and the drug accumulates. In patients with liver impairment, the dose should be reduced. The 10 mg and 25 mg strengths allow flexible dosing, but both carry the same side effect profile, including the risk of respiratory depression in young children and the risk of severe tissue injury if the injectable form is given incorrectly. The oral tablets are safer in this regard.

How to Use Phenergan

The dose depends on the condition and the patient's age. For nausea and vomiting in adults, the usual dose is 25 mg every 4 to 6 hours as needed, not exceeding 100 mg per day. For motion sickness, take 25 mg about 30 to 60 minutes before travel, and repeat every 12 hours if needed. For allergic conditions, the dose is 10 to 25 mg at bedtime, or 10 to 12.5 mg every 6 to 8 hours during the day. For short-term insomnia, a single 25 mg dose at bedtime is typical, but this should not be used for more than a few nights without medical advice. For children, the dose is weight-based, and promethazine is generally not recommended for children under 2 years because of the risk of severe breathing problems. In children over 2, the dose is usually 0.1 mg per kg of body weight, up to a maximum of 25 mg.

Take the tablet with a full glass of water, with or without food. Swallow it whole. Do not crush or chew it unless the tablet is scored and your doctor tells you it is okay. If you miss a dose and you are taking it on a schedule, take it as soon as you remember. If it is almost time for the next dose, skip the missed one. Do not double up. Phenergan can cause significant drowsiness, so the first dose is often taken at bedtime. If you are taking it during the day, avoid driving and other dangerous activities until you know how it affects you. Do not drink alcohol. Do not use it continuously for more than a few weeks without a doctor's evaluation.

Side Effects of Phenergan

The most common side effect is drowsiness. This can be profound, especially at the 25 mg dose. Many people feel groggy the next morning. Dry mouth, blurred vision, and constipation are anticholinergic effects. Sucking on sugar-free candy helps with dry mouth. Dizziness and lightheadedness can occur when standing up quickly. Rise slowly from sitting or lying. Some people experience confusion or disorientation, especially the elderly. Less common side effects include nausea, vomiting, and a paradoxical reaction of agitation or restlessness, which is more common in children and the elderly. Photosensitivity can occur, so use sunscreen. Jaundice and blood disorders are very rare but have been reported with long-term use.

Serious side effects include respiratory depression, which is a particular risk in children under 2 and in people with lung disease. Phenergan should never be given to a child under 2. Neuroleptic malignant syndrome is a rare but life-threatening reaction that can occur with phenothiazines, presenting with fever, muscle rigidity, and altered mental status. If you develop these symptoms, stop the drug and get emergency care. Tardive dyskinesia, a movement disorder with involuntary movements of the face and tongue, is a rare but potentially irreversible effect of long-term use. If you notice unusual movements, report them immediately. Phenergan can lower the seizure threshold in susceptible individuals. It also thickens bronchial secretions and should be used with caution in people with asthma or COPD.

High-Risk Groups (Elderly, Pregnancy)

Pregnancy. Promethazine is pregnancy category C. It has been used for decades during pregnancy for nausea and vomiting, including hyperemesis gravidarum, and is generally considered safe when used at the lowest effective dose. It is not a first-line treatment because newer options with more safety data exist, like doxylamine-pyridoxine, but promethazine is still widely prescribed. It can cause sedation in the newborn if used near delivery. Always discuss with your obstetrician. Breastfeeding. Promethazine passes into breast milk in small amounts and can cause drowsiness and poor feeding in the infant. The manufacturer recommends against its use while breastfeeding. If you need an antihistamine or antiemetic while nursing, discuss safer alternatives with your doctor.

Elderly patients are very sensitive to the sedative and anticholinergic effects of promethazine. It is on the Beers list of potentially inappropriate medications for older adults because it can cause confusion, falls, constipation, and urinary retention. If used at all, the dose should be the lowest effective, usually 10 mg, and the duration should be short. People with glaucoma, enlarged prostate, bowel obstruction, or myasthenia gravis should not use promethazine. Those with severe respiratory disease, sleep apnea, or a history of seizures need caution. Patients with liver impairment may require a lower dose. A complete medication review is essential before starting, especially in older adults and those with multiple health problems.

Interaction With Activities (Driving, Alcohol)

Promethazine causes significant drowsiness and impairs coordination. Do not drive or operate heavy machinery until you know how it affects you, and even then, be cautious. The impairment can persist into the next day, especially after a nighttime dose. Alcohol is absolutely to be avoided. Alcohol multiplies the sedative effects of promethazine, leading to dangerous levels of drowsiness, slowed breathing, and impaired judgment. Even one drink can be too much. Do not combine alcohol with promethazine. If you are taking it for motion sickness, arrange for someone else to drive. Caffeine does not counteract the impairment. The only safe approach is to avoid driving and alcohol entirely while on this medication.

Drug Interactions

Promethazine has many interactions, mostly additive sedation and anticholinergic effects. Combining it with other central nervous system depressants, including benzodiazepines, opioids, sleeping pills, muscle relaxants, and other sedating antihistamines, can cause severe respiratory depression and coma. These combinations should be avoided or used only in a monitored hospital setting. Anticholinergic drugs like tricyclic antidepressants, antipsychotics, and bladder medications add to the dry mouth, constipation, and confusion. Monoamine oxidase inhibitors (MAOIs) can prolong and intensify the effects of promethazine. The combination is contraindicated. Promethazine can reduce the effectiveness of levodopa in Parkinson's disease by blocking dopamine. It can also interfere with certain diagnostic tests, including pregnancy tests and skin allergy tests. Always tell your doctor and pharmacist about all medications and supplements you take before starting Phenergan. Do not add new drugs without checking.

Alternative Options

For allergies, second-generation antihistamines like cetirizine, loratadine, and fexofenadine are preferred because they cause less sedation and are taken once daily. For nausea, ondansetron is a newer antiemetic with fewer side effects and no significant sedation. For motion sickness, dimenhydrinate or scopolamine patches are common alternatives. For short-term insomnia, non-pharmacological approaches like sleep hygiene and cognitive-behavioural therapy are more effective long-term. If a sedating antihistamine is needed, doxylamine is another option. Promethazine is often used when a combination of antihistamine, antiemetic, and sedative effects is desired in one drug. It remains popular in hospital and surgical settings. The choice depends on the cause of the symptoms, the patient's age, and the need for sedation. Phenergan is a powerful, effective drug, but its side effect profile means it is not the first choice for most outpatient conditions.

INN, Brand Names, and Classification in Canada

INN (International Nonproprietary Name): Promethazine hydrochloride
Available brand names in Canada: Phenergan, and generic promethazine
ATC code: R06AD02
Forms and strengths: Tablets 10 mg and 25 mg. Also available as suppositories, syrup, and injectable solution.
Manufacturers: Sanofi-Aventis Canada Inc. (Phenergan), and diverse generic manufacturers including Apotex Inc., Teva Canada Limited, and Sandoz Canada Inc.
Registration status in Canada: Registered
Classification: Prescription (Rx)

Frequently Asked Questions

Can I use Phenergan for sleep every night?
It is not recommended for long-term sleep use. The sedation may work initially, but tolerance develops, and the anticholinergic effects can cause problems. If you have chronic insomnia, see your doctor about safer, more effective treatments. Phenergan is best used for occasional, short-term sleep difficulty or for specific situations like nausea after surgery.

Why is promethazine dangerous in children?
Children under 2 are at risk of severe respiratory depression from promethazine. It can slow breathing to dangerous levels. For children over 2, the dose must be carefully calculated by weight, and the drug should be used with caution. Never give adult-strength Phenergan to a young child.

Will Phenergan make me gain weight?
Weight gain is not a common side effect of promethazine. The antihistamine effect can increase appetite in some people, but it is not as pronounced as with cyproheptadine. If you notice significant weight gain, talk to your doctor.

Can I take Phenergan for anxiety?
Promethazine is sometimes used for mild sedation and anxiety, but it is not a first-line anxiety treatment. It can make you sleepy and calm, but it does not treat the underlying anxiety disorder. For anxiety, SSRIs or therapy are more effective. Use promethazine only as directed by your doctor.

What should I do if I miss a dose?
If you are taking it on a schedule, take it as soon as you remember. If it is almost time for the next dose, skip the missed one. Do not double up. For as-needed use, just take it when symptoms occur, but do not exceed the recommended daily maximum.

Delivery Information Across Canada

We ship Phenergan and generic promethazine to all provinces and territories. Delivery times vary depending on how remote your location is:

• Ontario (Toronto, Ottawa, Mississauga): 5 to 7 days
• Quebec (Montreal, Quebec City, Laval): 5 to 7 days
• British Columbia (Vancouver, Victoria, Burnaby): 5 to 9 days
• Alberta (Calgary, Edmonton, Red Deer): 5 to 9 days
• Manitoba (Winnipeg, Brandon): 5 to 9 days
• Saskatchewan (Saskatoon, Regina): 5 to 9 days
• Nova Scotia (Halifax, Sydney): 5 to 9 days
• New Brunswick (Moncton, Fredericton): 5 to 9 days
• Newfoundland and Labrador (St. John's, Corner Brook): 7 to 14 days
• Prince Edward Island (Charlottetown): 7 to 14 days
• Yukon, Northwest Territories, Nunavut: 7 to 14 days

All shipments are packed discreetly with no branding or indication of contents on the outside.

How to buy Generic Phenergan (Promethazine) no prescription from Canadian Pharmacy.