If you have ever stood in front of a pharmacy shelf or searched online wondering about phenergan vs promethazine, the short answer is yes. Phenergan is a brand name, while promethazine hydrochloride is the active ingredient and generic name.
For adults in the UK looking for clear, practical information before buying or using this medicine, that difference is useful to understand. It can help when you are reading labels, comparing branded and generic products, or looking at treatment options for short term insomnia, allergies or travel sickness. This guide explains how the brand and generic names relate, what type of medicine promethazine is, how availability can differ between products, how it is used, the main safety points to know, and how it differs from a separate medicine such as Compro.
Key things to know
- Phenergan and promethazine are not two different active ingredients. Phenergan is a brand name, while promethazine hydrochloride is the active ingredient.
- Promethazine is a first generation, sedating antihistamine from the phenothiazine group.
- In the UK, oral Phenergan products are used for allergic conditions, travel sickness and short term insomnia in adults.
- Compro is a different medicine. It contains prochlorperazine rather than promethazine.
What Is Phenergan?
Phenergan is a brand name for medicines containing promethazine hydrochloride. It has been used in the UK for many years and is available as 25mg tablets and as an oral elixir.
The exact product, strength and ingredients can vary between formulations, so it is worth checking the packaging or patient information leaflet for the product you have.
What Is Promethazine?
Promethazine hydrochloride is the active ingredient in Phenergan. It is the name used to describe the medicine itself rather than the brand.
So, when you see "promethazine hydrochloride" on a medicine label, you are looking at the active ingredient found in Phenergan. Other medicines can also contain promethazine, but the product name, strength, formulation and inactive ingredients may differ.
Phenergan vs Promethazine: Are They the Same Medicine?
However you have typed the question, whether that is phenergan vs promethazine, is promethazine the same as phenergan, promethazine vs phenergan, is promethazine and phenergan the same thing, is phenergan the same as promethazine, is promethazine phenergan, is phenergan and promethazine the same, is phenergan promethazine, promethazine and phenergan the same, promethazine is phenergan, promethazine same as phenergan, are promethazine and phenergan the same thing, phenergan same as promethazine, are phenergan and promethazine the same, promethazine phenergan, or is promethazine the same thing as phenergan, the answer is that Phenergan contains promethazine hydrochloride as its active ingredient.
What can differ between branded and other formulations is the packaging, tablet appearance and inactive ingredients, also known as excipients. These ingredients can vary between products, so if you have had a reaction or intolerance to a particular formulation, ask a pharmacist before switching products.
| Phenergan (brand) | Promethazine (generic name) | |
|---|---|---|
| What it is | Brand name for a medicine containing promethazine hydrochloride | The generic name of the active ingredient |
| Active ingredient | Promethazine hydrochloride | Promethazine hydrochloride |
| Legal category | Pharmacy (P) medicine | Legal status depends on the specific product |
| Formulations | 25mg tablets and 5mg in 5ml oral elixir | Available formulations can vary by manufacturer |
| Regulatory standard | Licensed medicine that must meet UK regulatory requirements | Licensed products must meet the relevant UK regulatory requirements |
Phenergan's Drug Classification
Promethazine is a first generation, sedating H1 antihistamine from the phenothiazine group. It also has anticholinergic and anti dopaminergic effects.
Unlike some newer antihistamines, promethazine can cause noticeable drowsiness. This is one reason it is used for conditions such as allergies, travel sickness and short term insomnia.
It works partly by blocking histamine, a chemical involved in allergic reactions. Its other effects also help explain why it can be used for nausea, vomiting and some other symptoms.
Brand Name vs Generic Name Explained
The confusion behind searches for phenergan generic or generic phenergan usually comes down to how medicine names work.
A medicine has a generic or non proprietary name that describes its active ingredient. It may also have a brand name chosen by the company that markets the product.
Promethazine hydrochloride is the generic name of the active ingredient. Phenergan is a brand name for a medicine containing that ingredient.
A pharmacist may be able to supply a licensed promethazine product instead of a branded product in some circumstances, depending on the prescription, product availability and the rules that apply to that medicine.
Another way to think about phenergan other name is that promethazine hydrochloride describes the active ingredient. It does not mean that promethazine is a stronger or weaker version of Phenergan.
Is a Generic Version of Phenergan Available in the UK?
Yes, medicines containing promethazine hydrochloride are available from different manufacturers in the UK. However, the exact product, strength, formulation and inactive ingredients can vary.
Because of this, it is better to compare the specific products rather than assume that every promethazine product is identical to Phenergan in every detail.
It is also worth being clear about what EverydayMeds supplies: the products available to buy on this site are Phenergan branded 25mg tablets and 5mg in 5ml elixir. If you are comparing the price with another product, check the exact strength, pack size and formulation before making a comparison.
Phenergan vs Compro: A Different Medicine Entirely
Compro is not another name for Phenergan or promethazine. Compro is a brand name used for prochlorperazine, which is a different phenothiazine medicine.
Prochlorperazine and promethazine are related because they are both part of the wider phenothiazine group, but they contain different active ingredients and have different uses and dosing instructions.
Compro is not the brand name used for prochlorperazine in the UK. UK products containing prochlorperazine include medicines such as Stemetil and Buccastem. These are different products from Phenergan.
Using Promethazine (Phenergan) for Sleep
Promethazine, including branded Phenergan, is licensed in the UK for the short term treatment of insomnia in adults. It is also used for allergies and travel sickness.
The drowsiness caused by promethazine is part of how the medicine works in the brain. This can make it useful for short term sleep problems, but it is not intended as a long term sleep treatment.
Do not use Phenergan for longer than 7 days without speaking to a doctor or pharmacist. If the medicine feels too weak or too strong, do not change the dose yourself. Speak to a pharmacist or prescriber instead.
When used for sleep, the dose is normally taken at night. Follow the instructions on the product or the advice given by your healthcare professional.
Who Should Not Take Promethazine
Promethazine is not suitable for everyone. The following information is general guidance and does not replace an individual assessment by a healthcare professional.
| Contraindication | Detail |
|---|---|
| Known hypersensitivity | To promethazine, other phenothiazines or any of the other ingredients in the product |
| Children under 6 years | Oral Phenergan products should not be used in children under 6 years |
| Coma or CNS depression | Phenergan should not be used in people who are in a coma or have central nervous system depression |
| MAOIs | Phenergan should be avoided in people taking monoamine oxidase inhibitors or who have stopped taking them within the previous 14 days |
| Use beyond 7 days | For insomnia, do not use for longer than 7 days without seeking medical advice |
Other conditions may require extra caution rather than meaning that promethazine cannot be used. These include asthma and other breathing problems, epilepsy, liver or kidney problems, Parkinson's disease, glaucoma, prostate problems and certain heart conditions.
Older adults can be more sensitive to the sedating and anticholinergic effects of promethazine. If any of these points apply to you, speak to a pharmacist or prescriber before taking it.
Cautions, Drug Interactions, and Side Effects
Drowsiness or sedation is a very common side effect of promethazine. Other possible side effects include dry mouth, constipation, blurred vision, dizziness and difficulty passing urine.
Promethazine can interact with other medicines that cause drowsiness or have anticholinergic effects. It can also interact with some antidepressants, medicines used for mental health conditions and certain medicines used for heart problems or epilepsy.
Do not drink alcohol while taking Phenergan because it can increase the effects of the medicine. Take care with driving or operating machinery, as promethazine can cause drowsiness and affect your ability to concentrate.
Promethazine can also cause increased sensitivity to sunlight, so avoid strong sunlight and ultraviolet light during or shortly after treatment.
Rare but serious reactions can occur. These include severe allergic reactions, abnormal muscle movements and certain heart rhythm problems. If you develop severe symptoms or think you are having a serious reaction, seek urgent medical advice.
This article focuses on oral Phenergan products. Injectable promethazine has different uses, risks and administration requirements and should only be given by an appropriately trained healthcare professional.
Phenergan Tablets and Elixir: Your Options
EverydayMeds supplies branded Phenergan in two formats. Both are pharmacy (P) medicines rather than prescription only medicines, although you still need to complete the relevant pharmacy safety checks before purchase.
| Product | Strength | Pack size | Price |
|---|---|---|---|
| Phenergan Tablets | 25mg promethazine hydrochloride | 56 tablets | £14.99 |
| Phenergan Elixir | 5mg in 5ml oral solution | 100ml | £14.49 |
Prices shown are EverydayMeds' standard listed prices at the time of writing and can change. Check the current product page for the latest price before you order.
Medical Disclaimer
This article is provided for general information only and does not constitute medical advice. It is not a substitute for advice from a qualified healthcare professional.
Promethazine, including branded Phenergan, is not suitable for everyone. Before using it, check the patient information leaflet and speak to a pharmacist or prescriber if you have any medical conditions, take other medicines, are pregnant or breastfeeding, or are unsure whether it is suitable for you.
Do not change the recommended dose or use the medicine for longer than advised without speaking to a healthcare professional. In an emergency, call 999 or go to your nearest A&E.
