If you have been trying to work out whether Phenergan and promethazine are the same thing, or two different medicines that do something similar, here's the short answer: they are the same medicine.
Phenergan is a brand name, and promethazine is the ingredient inside it. This is one of the most common points of confusion with medicines, because the same drug is often sold under both its generic name and one or more brand names, and it is easy to assume different names mean different products. This guide clears it up, explains what's actually in Phenergan, and covers how the medicine is used in the UK.
Key things to know
- Phenergan is the brand name; promethazine hydrochloride is the active ingredient.
- They are the same medicine, used interchangeably by doctors and pharmacists.
- Phenergan's generic name is promethazine, just as Panadol's is paracetamol.
- Both Phenergan tablets and elixir contain promethazine as the only active ingredient.
- In the UK, Phenergan is a pharmacy medicine, sold after a suitability check.
Is Phenergan the Same as Promethazine?
Yes. Phenergan is the UK brand name for promethazine hydrochloride, and there is no difference between the two beyond the name on the box.
When a pharmacist or doctor talks about "promethazine" and "Phenergan," they are referring to the same active ingredient and often use the words interchangeably. So if you have seen both names and wondered whether you are looking at two separate treatments, you are not, they are the same medicine .
This happens with a lot of everyday medicines. The ingredient has one official name, and the finished, branded product has another.The brand or generic name identifies the medicine's active ingredient, while the specific product determines its strength and formulation.
Brand Name vs Generic Name: What's the Difference?
Every medicine has a generic name, which is the name of the active ingredient itself, and it may also have one or more brand names, which are the trade names companies give their versions of that medicine. Promethazine is the generic name. Phenergan is a brand name. You will recognise the same pattern across your bathroom cabinet:
- Example: Paracetamol is the generic name; Panadol is a brand name for it.
- Example: Ibuprofen is the generic name; Nurofen is a brand name for it.
- Example: Promethazine is the generic name; Phenergan is a brand name for it.
A licensed generic medicine contains the same active ingredient and is expected to have the same therapeutic effect as the corresponding branded medicine. The brand name typically reflects the original manufacturer and often costs a little more, while the generic version is the same medicine sold under its ingredient name. Phenergan is marketed in the UK by Opella Healthcare UK .
What Is Phenergan's Generic Name?
Phenergan's generic name is promethazine hydrochloride, usually shortened to promethazine. If a prescription, pharmacy label or leaflet says "promethazine," that's the same medicine as Phenergan. Occasionally, you may also see promethazine sold under its ingredient name rather than the Phenergan brand. It is the same medicine, simply labelled generically .
What Are the Ingredients in Phenergan?
Phenergan comes in more than one formulation, and the active ingredient is promethazine hydrochloride in both. The strength and inactive ingredients differ between formulations.
Phenergan Tablets
The active ingredient is promethazine hydrochloride. UK Phenergan tablets are film-coated and come in more than one strength. Alongside the active ingredient, tablets contain inactive excipients such as those used in the coating and the tablet core, which are listed in full in the patient information leaflet.
Phenergan Elixir
Phenergan Elixir is a liquid oral solution, again with promethazine hydrochloride as the single active ingredient. Being a liquid formulation, it contains different inactive ingredients from the tablets, including those used to create and flavour the solution . If you have allergies or intolerances, the full excipient list on the leaflet is the place to check, since that's where tablets and elixir genuinely differ.
Promethazine vs Phenergan: Is There Any Difference at All?
In terms of the active medicine, they contain the same active ingredient. The main practical differences are the brand name, strength, formulation, price and inactive ingredients. The only practical differences you might encounter are the ones that come with any brand-versus-generic pairing:
- Naming: The name on the packaging (Phenergan vs promethazine)
- Cost: Price can differ, as branded products often cost a little more than their generic equivalent
- Excipients: Inactive ingredients can vary between one manufacturer's version and another's, which matters only if you have a specific excipient allergy
These differences do not normally change the therapeutic action of the active ingredient, although excipients can matter if you have an allergy or intolerance. If a prescriber recommends promethazine and you are supplied with a box labelled Phenergan, or vice versa, you have received the correct medicine .
What Is Promethazine Used For?
No change required . In the UK, it is licensed for several uses, including allergic conditions, nausea and vomiting, and the short-term treatment of insomnia in adults . Its sedating effect is why it is used for short-term sleep problems as well as for allergy symptoms. Because it causes drowsiness, it may be used when a sedating antihistamine is appropriate, rather than a non-drowsy antihistamine intended for daytime use .
Whichever use applies to you, promethazine should not be used for longer than 7 days for insomnia unless advised by a healthcare professional , and it isn't suitable for everyone, which is why a suitability check matters before taking it. For more on what to expect, see our Phenergan side effects guide.
Is Phenergan Prescription-Only in the UK?
No, Phenergan is a pharmacy (P) medicine in the UK, not a prescription-only medicine. That means it can be supplied without a prescription, but only after a pharmacist or registered prescriber is satisfied it is suitable for you. It is not a General Sales List (GSL) medicine and cannot be sold from general retail outlets. A suitability assessment forms part of its supply . At EverydayMeds, that check takes the form of a short online clinical assessment.
Buying Phenergan from EverydayMeds
EverydayMeds is a GPhC-registered UK pharmacy supplying Phenergan tablets and elixir . Whether you search for "Phenergan" or "promethazine," it is the same medicine, and it is supplied following an online clinical assessment so a UK licensed prescriber can confirm it is appropriate for you before dispatch. If you have questions about which formulation may be suitable, our clinical team can provide further information before you order .
Medical Disclaimer
This article is for general information only and does not replace advice from a doctor or pharmacist. Treatment suitability depends on an individual clinical assessment, which is why EverydayMeds asks health questions before supplying Phenergan. Results and side effects vary between individuals. Promethazine is a sedating medicine with important cautions and contraindications, so always read the patient information leaflet and check with a healthcare professional if you are unsure. This page should be checked against the current promethazine SmPC and patient information leaflet before publishing.
