It is easy to assume that Phenergan tablets and elixir can be stored in the same way. However, the UK product information gives different storage instructions for each form. Phenergan tablets should be stored below 30°C in their original carton to help protect them from light. Phenergan Elixir should be stored below 25°C in its outer carton and should be discarded one month after opening, even if the expiry date on the bottle or packaging has not passed.
For UK adults who use or are considering Phenergan for allergies, nausea or other approved uses of promethazine, these storage instructions are worth following carefully. Medicines can be exposed to heat and light during everyday storage, particularly during warmer weather or when travelling. Keeping an opened bottle of elixir for too long can also mean using it beyond the recommended period after opening.
This can be particularly important during a heatwave, when travelling in a parked car, in homes where children may have access to medicines, or when you have a partly used bottle left over from a previous season.
The information below is based on the UK Summaries of Product Characteristics for the two Phenergan formulations. It covers the recommended temperature and packaging requirements for tablets and elixir, how long the elixir can be kept after opening, safe disposal, and practical storage and travel considerations.
Key things to know about Phenergan (promethazine hydrochloride)
- Phenergan tablets should be stored below 30°C and kept in their original carton.
- Phenergan Elixir should be stored below 25°C and kept in its outer carton. The two temperature limits are different.
- An opened bottle of Phenergan Elixir should be discarded one month after opening, even though an unopened bottle has a longer shelf life.
- Phenergan tablets have a three year shelf life from manufacture, subject to the expiry date shown on the packaging.
- Neither formulation needs to be refrigerated, unless a healthcare professional or the product information specifically advises otherwise. Storing the medicine in a fridge is not required.
- The carton forms part of the storage instructions because it helps protect the medicine from light.
Phenergan storage at a glance and patient information leaflet
| Phenergan tablets | Phenergan Elixir 5mg/5ml | |
|---|---|---|
| Temperature | Store below 30°C | Store below 25°C |
| Packaging | Original carton, to protect from light | Outer carton |
| Shelf life | 3 years | 2 years unopened |
| Once opened | No separate in-use limit; go by the printed expiry date | Discard 1 month after opening |
| Refrigeration | Not required | Not required |
| Freezing | No | No |
If you take one row from this table, take the one about the elixir after opening. It is the figure most storage guidance omits, and the one most likely to be relevant to a bottle already in your cupboard.
Storing Phenergan tablets
The correct temperature
The UK product information for Phenergan tablets states that they should be stored below 30°C. This is the specific storage limit given for the tablets.
You may come across websites, including some pharmacy websites, that suggest storing Phenergan at 15 to 25°C. However, this temperature range is not stated as the storage requirement for Phenergan tablets in the UK product information. It may reflect general guidance for storing medicines at room temperature rather than the specific instructions for Phenergan.
For most of the year, this difference may not be particularly noticeable in a typical UK home. However, it can become relevant during periods of very warm weather. Knowing the specific storage temperature can help you follow the manufacturer's instructions and avoid unnecessary concerns about a pack that has been stored correctly.
Why the carton is part of the instruction
The storage instruction is not simply to keep the tablets in their blister packaging. Phenergan tablets should be kept in the original carton because the carton helps protect the medicine from light.
The blister and carton also make it easier to keep the medicine identifiable and check important information such as the expiry date and the patient information leaflet. Keeping the medicine in its original packaging can therefore be useful as well as following the stated storage instructions.
It is also easier to identify a medicine when the blister remains inside its original carton. This can be particularly helpful if you have several medicines stored at home.
The pill organiser question
Moving Phenergan tablets into a weekly pill organiser means removing them from their original packaging. This may also expose them to conditions that are different from those specified in the product information, including light and moisture.
Phenergan is intended for short term use in the relevant conditions, so if you are regularly putting it into a pill organiser for repeated or long term use, it may be worth discussing this with a pharmacist. Regular use may also be a reason to review whether continued treatment with Phenergan is appropriate.
If you genuinely need a compliance aid
A pill organiser can be useful for people who take several medicines and find it easier to keep track of their doses. However, not every medicine is suitable for being removed from its original packaging and stored in an organiser.
If you need a compliance aid, ask your pharmacist whether Phenergan can be stored in the particular organiser you use. They can also advise you about the storage requirements for your other medicines and whether a multi compartment aid would be suitable.
If there is any doubt about transferring Phenergan tablets from their original packaging, keeping them in the original carton and blister until they are needed is the simplest way to follow the product's storage instructions.
Storing Phenergan Elixir
A tighter temperature limit than the tablets
Phenergan Elixir should be stored below 25°C and kept in its outer carton. This is a lower temperature limit than the one given for Phenergan tablets, so it is important to follow the storage instructions for the specific formulation you have.
Keep the cap securely closed between uses and, where possible, store the bottle upright to help reduce the risk of leakage. As with other liquid medicines, keeping the container properly closed can help protect the contents from the surrounding environment. Do not refrigerate or freeze the elixir unless a healthcare professional or the product information specifically advises you to do so.
The one month rule after opening
An unopened bottle of Phenergan Elixir has a shelf life of two years, subject to the expiry date shown on the packaging. Once the bottle has been opened, the in use shelf life is one month.
This means the printed expiry date is not the only date to consider after opening. The one month in use period should be followed even if the expiry date on the bottle or carton is later.
For example, if you open a bottle for a short period of hay fever symptoms, it should not be kept and used again the following summer. If you find a partly used bottle in a cupboard and cannot confirm when it was opened, do not assume that the printed expiry date means it is still suitable to use. Ask a pharmacist how to dispose of it and obtain a new supply if needed.
How to make the rule work in practice
Write the date you opened the bottle on the carton as soon as you first use it. This is a simple way to keep track of the one month in use period.
You can also use a label if that is easier. Keeping the opening date with the bottle and packaging makes it much easier to check whether the medicine is still within its recommended in use period.
If you cannot establish when the bottle was opened, speak to a pharmacist before using it.
Does Phenergan need to be kept in the fridge?
No. Phenergan tablets and Phenergan Elixir do not require refrigeration under their stated storage instructions.
The storage requirements are based on maximum temperatures rather than a need to keep the medicine as cold as possible. Phenergan tablets should be stored below 30°C, while Phenergan Elixir should be stored below 25°C.
For tablets, keeping them in their original carton and storing them in a suitable, dry place is generally more appropriate than placing them in the fridge. Moving medicines repeatedly between a cold fridge and a warmer room can also expose the packaging to condensation.
For the elixir, refrigeration does not extend the one month in use period after opening. The important points are to keep it below the recommended temperature, in its outer carton, and properly closed between uses.
A cool, dry cupboard away from direct sunlight and heat sources can be a practical storage option for both formulations, provided the relevant temperature requirements are met.
Where in the house to keep it
The places that actually cause problems
Some areas of the home may expose medicines to more heat, humidity or sunlight than you might expect.
The bathroom cabinet is a common place to store medicines, but frequent changes in heat and humidity from showers can make it less suitable for medicine storage. A dry cupboard outside the bathroom is usually a better option.
Anywhere above or beside a heat source may become too warm, particularly during colder months when radiators, boilers or cooking appliances are in regular use. This includes cupboards above a hob, shelves near radiators and boiler cupboards.
Windowsills and conservatories can become hot and may expose medicines to direct sunlight. This is not ideal when the product information states that the medicine should be kept in its carton to help protect it from light.
A car glove compartment can expose medicines to excessive heat, particularly when a vehicle is parked in direct sunlight during warm weather. The temperature inside a parked car can rise considerably above the recommended storage temperature, so it is better not to leave Phenergan in a vehicle for extended periods.
Lofts, garages and sheds can experience large temperature changes throughout the year. Unless you can maintain the storage conditions specified for the medicine, these areas are generally not suitable for keeping Phenergan.
What a good spot looks like
A dry cupboard or drawer in a bedroom or hallway can be a practical option. Choose somewhere away from radiators, windows and other heat sources, and keep the medicine out of the sight and reach of children.
It can also help to keep household medicines together in one suitable storage area. This makes it easier to check expiry dates and storage conditions regularly and helps everyone in the household know where medicines are kept.
Protecting the medicine from light is not the same as protecting yourself
These two points are easy to mix up, but they refer to different things.
Keeping Phenergan in its original carton helps protect the medicine from light. This is a storage instruction for the product. The UK product information specifically says that Phenergan tablets should be kept in the original carton to protect them from light, while the elixir should be kept in its outer carton for the same reason.
Separately, promethazine can make the skin more sensitive to sunlight. The product information advises avoiding strong sunlight or ultraviolet light during treatment and shortly afterwards.
So, one instruction is about where you store the medicine. The other is about protecting yourself from strong sunlight while using Phenergan. Following the storage instructions does not remove the need to take appropriate precautions in the sun.
Shelf life and expiry dates
How long each formulation lasts
Phenergan tablets have a shelf life of three years. Phenergan Elixir has a shelf life of two years when unopened and one month once the bottle has been opened.
These periods relate to the product's stated shelf life. For everyday use, the expiry date printed on the packaging is the date you should check. For the elixir, remember that the one month in use period applies after opening, even if the printed expiry date is later.
What the printed date is really telling you
When an expiry date is shown as a month and year, it refers to the last day of that month. For example, a pack marked 03/2027 has an expiry date at the end of March 2027. The Phenergan patient information leaflet confirms that the expiry date refers to the last day of the stated month.
The expiry date assumes that the medicine has been stored according to its recommended storage conditions. If a pack has been exposed to excessive heat or otherwise stored incorrectly, speak to a pharmacist before using it rather than relying only on the printed expiry date.
If the medicine is past its expiry date, do not use it. Take it to a pharmacy for advice on safe disposal and obtain a new supply if needed.
When a pack should not be used
Speak to a pharmacist before using the medicine if any of the following apply:
- Tablets are discoloured, damaged, crumbling or otherwise look different from normal.
- The blister foil is split, punctured or damaged.
- The elixir has changed appearance, for example, if it becomes cloudy or develops visible particles.
- The medicine has an unusual smell.
- A bottle of elixir was opened more than one month ago, or you cannot establish when it was opened.
- The pack has been exposed to obvious extreme heat or has not been stored according to the product instructions.
- The printed expiry date has passed.
These signs do not necessarily confirm that a medicine has degraded, but they are good reasons to stop and ask a pharmacist rather than trying to assess its safety yourself. Medicines that have expired or have not been stored correctly may not be suitable for use.
If the packaging itself looks suspicious, such as poor quality printing, missing information, unusual labelling or a product that does not match what you ordered, do not use it. Keep the packaging and medicine and contact the pharmacy that supplied it. You can also report suspected problems with medicines through the MHRA Yellow Card scheme.
Storing Phenergan around children
Phenergan should not be given to children under 6 years of age. The UK product information states that promethazine must not be used in children under 6 because of the potential for serious respiratory depression and other serious effects.
It is also important to remember that Phenergan can cause sedation. The elixir is a liquid medicine, which can make accidental ingestion easier for a young child.
Keep Phenergan out of the sight and reach of children. If possible, store it in a secure, locked place, particularly if young children regularly visit your home. A bedside table may be convenient, but it is not a good storage location if a child could reach it.
If you think a child has swallowed Phenergan, seek medical advice promptly. The NHS advises contacting NHS 111 if you or a child takes more than the recommended dose of promethazine, even if there are no symptoms. Call 999 or go to A&E if there are serious symptoms such as breathing problems, a seizure or loss of consciousness.
Take the medicine packaging or leaflet with you if medical attention is needed so that the product and strength can be identified.
Travelling with Phenergan
Cars and UK journeys
Try to keep Phenergan with you rather than leaving it in the boot, glove compartment or another part of the car that can become very hot. Take it with you when you park, particularly during warm or sunny weather.
A parked car can become considerably hotter than the surrounding air, so leaving medicines inside for several hours may expose them to temperatures outside their recommended storage conditions. This is particularly relevant for Phenergan Elixir, which should be stored below 25°C.
Flights and hot countries
For air travel, keeping medicines in your hand luggage can make them easier to access and reduces the risk of being separated from your medicine if checked baggage is delayed or lost. Keep Phenergan in its original carton and take the patient information leaflet with you.
If you are travelling to a hot climate, pay particular attention to the storage temperature. Phenergan Elixir should be stored below 25°C, while the tablets should be stored below 30°C.
If you expect that you may not be able to keep the medicine within these temperatures, speak to a pharmacist before travelling. They can help you decide which formulation and storage arrangements are appropriate for your trip.
Disposing of Phenergan safely
Getting rid of unwanted medicine does not need to be complicated. UK pharmacies have systems for accepting medicines for safe disposal, so you do not need to put unwanted Phenergan in your household bin or pour it down the sink.
Where to take unwanted medicine
Take unwanted, expired or damaged Phenergan to a pharmacy and ask about safe disposal. Many registered pharmacies in the UK accept unwanted medicines, although it is worth checking with your local pharmacy first.
You do not usually need to have bought the medicine from that pharmacy, and there is normally no charge for returning unwanted medicines for disposal. You can simply hand it to the pharmacy team and explain that you would like it disposed of safely.
If the pack has a dispensing label with your name or other personal details, remove or cover the label before returning it where practical. This can help protect your personal information.
When to dispose of a pack
Phenergan is intended for short term use, and the product information states that it should not be used for longer than 7 days without seeking medical advice. If you have leftover medicine, consider returning it to a pharmacy rather than keeping it indefinitely.
A pack may be suitable for disposal if the printed expiry date has passed, a bottle of elixir was opened more than one month ago, or you cannot establish when it was opened. You should also ask a pharmacist about disposal if the medicine has been exposed to extreme temperatures, its appearance or smell has changed, or a healthcare professional has advised you to stop taking it.
If you suspect that a product may be falsified or faulty rather than simply expired, do not use it. Keep the product and packaging and report the concern to the pharmacy that supplied it or through the MHRA Yellow Card scheme. Keeping the packaging can help provide useful information when a suspected product quality problem is investigated.
Why bins and toilets are the wrong route
Do not put unwanted medicines down the toilet or sink unless you have specifically been instructed to do so. Medicines should generally be returned to a pharmacy for appropriate disposal.
Putting medicines in household waste can also create a risk of accidental exposure for children or pets. This is particularly important with Phenergan because promethazine can cause drowsiness and the medicine should not be given to children under 6 years of age.
Returning unwanted medicine to a pharmacy is a simple way to make sure it is handled through the appropriate disposal system.
Never pass Phenergan on to someone else
It can be tempting to offer leftover medicine to a family member or friend, particularly if they have similar symptoms. However, you should not give your Phenergan to someone else.
The pharmacy assessment takes account of factors such as the person's age, medical conditions, other medicines and the reason for treatment. These factors can affect whether promethazine is suitable.
For example, Phenergan should not be used by children under 6 years of age, and the product information includes important precautions and interactions with other medicines, including monoamine oxidase inhibitors and other medicines that can cause sedation. (medicines.org.uk)
If someone needs an antihistamine or another medicine for their symptoms, it is better for them to speak to a pharmacist or another healthcare professional so they can receive advice based on their own circumstances.
What to do with the empty packaging
Once the medicine has been removed, some packaging can usually be disposed of through your normal household waste or recycling system, depending on your local council's recycling rules.
Cardboard cartons and paper leaflets may be recyclable, but recycling rules for blister strips vary between councils. Check your local recycling guidance or ask a pharmacy about available medicine packaging collection schemes.
If you are returning full or partly used blister packs to a pharmacy for disposal, keep them together with the original packaging where possible. Do not remove the tablets from the blister before returning them.
Medical Disclaimer
This page provides general information and does not replace advice from a qualified healthcare professional. It does not provide dosing instructions, and the information should not be used to start, stop or change your medicine without appropriate medical advice. Promethazine hydrochloride is licensed in the UK for several uses, including allergic conditions, travel sickness, nausea and vomiting, and short term treatment of insomnia in adults. Whether it is suitable depends on individual circumstances and should be assessed by a healthcare professional where appropriate. (medicines.org.uk)
Always read the patient information leaflet supplied with your medicine. Speak to a pharmacist, GP, NHS 111 or another healthcare professional if you are unwell or unsure about using Phenergan, if you take herbal products or other medicines, or if you are pregnant or breastfeeding. Promethazine may also affect the results of some laboratory tests, so tell your healthcare professional that you are taking it if you are having tests.
If you think you or someone else has taken too much promethazine, seek medical advice promptly. If a child has swallowed Phenergan, seek medical advice straight away. Call 999 or seek emergency medical help if there are serious symptoms such as severe difficulty breathing, loss of consciousness or a seizure.
Promethazine can cause drowsiness, dizziness and other side effects. Serious reactions are possible, including uncontrolled movements, and require prompt medical attention. Do not drive, operate machinery or drink alcohol until you know how promethazine affects you. Alcohol can increase the sedative effects of promethazine. (nhs.uk)
The information on this page is based on the UK Summaries of Product Characteristics for Phenergan tablets and Phenergan Elixir and NHS guidance on promethazine. Always check the latest patient information leaflet and seek professional advice if you are unsure about your medicine.
