Wondering how long promethazine lasts after opening? For Phenergan, the shelf life depends on whether you have tablets or the liquid elixir. The 25mg tablets can generally be kept until the expiry date shown on the packaging when they remain in their original blister pack and are stored as directed. Phenergan elixir should be used within 1 month of opening and should never be used after the expiry date on the bottle.
If you use or are considering promethazine, it is useful to know how to store it properly and when it should be replaced. This guide explains expiry dates, storage, whether Phenergan needs to be refrigerated, signs that the medicine may have changed, what to do with expired medicine, and how to dispose of it properly.
Does Promethazine Expire or Have an Expiration Date?
Yes. Phenergan (promethazine) has an expiry date, which is shown on the packaging. For tablets, you can usually find it on the carton and blister foil. For the elixir, check the carton and bottle label.
The expiry date tells you how long the medicine is expected to remain suitable for use when it has been stored according to the manufacturer's instructions. Do not use Phenergan after the expiry date. If you are unsure whether a pack is still suitable to use, check the packaging or speak to a pharmacist.
How Long Does Phenergan Last?
The shelf life can differ between Phenergan tablets and the liquid elixir:
- Phenergan 25mg tablets have a shelf life of around 3 years from manufacture. If they are kept in their original blister packaging and stored as directed, follow the printed expiry date on the pack. There is generally no separate countdown after opening the outer packaging as long as the individual tablets remain sealed in their blister.
- Phenergan elixir has a shelf life of around 2 years when unopened. Once the bottle has been opened, it should be used within 1 month and never after the printed expiry date, whichever comes first. Always check the instructions supplied with your particular product, as storage and use after opening can vary between medicines.
So, when people ask how long Phenergan lasts after opening, this is mainly relevant to the elixir. For tablets, keep them in the blister and follow the expiry date on the pack.
Does Phenergan Need to Be Refrigerated?
No. Phenergan does not normally need to be stored in the fridge. The tablets should be stored below 30°C and the elixir below 25°C, unless the instructions for your particular product say otherwise.
For most people, this means keeping it at normal room temperature in a cool, dry place. Keep it away from direct sunlight, radiators and other sources of heat. Avoid places where there is a lot of moisture or where the temperature can change often.
Refrigeration is not normally needed for Phenergan elixir. Always check the product packaging or patient information leaflet for the storage instructions for your specific medicine.
Is It Safe to Take Expired Phenergan?
It is best not to take Phenergan after its expiry date. Once the expiry date has passed, the medicine may not be expected to meet the same quality and stability requirements as it did before that date.
This does not mean that an expired antihistamine will necessarily become harmful or toxic. However, you cannot rely on an expired medicine to have the expected quality or effectiveness. This is particularly important with liquid medicines, which may have additional instructions about how long they can be used after opening.
If your Phenergan is out of date, replace it with a new supply rather than using it. If you are unsure what to do with an old pack, ask a pharmacist.
Does Phenergan Go Off, and How Would I Know?
Medicines can change over time, especially if they have not been stored as directed. Heat, moisture and light may affect medicines, and liquid medicines may have specific instructions about how long they can be used after opening.
Do not use Phenergan if:
- The expiry date has passed.
- The tablets look different from usual, such as being discoloured, damaged or crumbling.
- The elixir has changed colour or appearance.
- The elixir contains unexpected particles or has an unusual smell.
- The packaging is damaged and you are unsure whether the medicine has been affected.
Changes in appearance do not always tell you whether a medicine is safe or effective. If you notice anything unusual or are unsure, ask a pharmacist before using it.
How to Store Phenergan in Your Medicine Cabinet So It Lasts
Storing Phenergan correctly can help you keep it in good condition until the expiry date:
- Keep it in its original packaging. Keep tablets in their blister strip and keep the elixir in its original bottle with the cap closed properly.
- Store tablets below 30°C and the elixir below 25°C, unless your product packaging gives different instructions.
- Keep it dry and away from direct sunlight and sources of heat, such as radiators, hobs and other hot appliances.
- Avoid storing it in the bathroom or near a kitchen sink, where moisture and changes in temperature can occur.
- Avoid leaving it in a car, on a sunny windowsill or in another place where the temperature may become very high.
- Keep tablets in their blister packaging rather than moving them into a pill organiser for long periods, unless a healthcare professional has advised you to do so.
- Keep Phenergan out of the sight and reach of children and pets.
A cool, dry cupboard or drawer is usually a better option than a bathroom medicine cabinet.
What to Do With Expired Medicines or Unwanted Phenergan
If you have expired or unwanted Phenergan, take it to a pharmacy and ask about safe disposal. Do not pour liquid medicine down the sink or flush it down the toilet unless a healthcare professional or the product instructions specifically tell you to do so.
Do not keep old medicine at home in case you need it later. A pharmacist can advise you on the appropriate way to dispose of it and whether your local pharmacy accepts unwanted medicines.
If you have other unwanted medicines at home, including antibiotics or medicines that could be misused, it is also a good idea to ask your pharmacist about the correct disposal method.
