A bedroom drawer or a high kitchen cupboard, away from the hob and the sink. That is the right place for most medicines: cool, dry, dark and out of children’s reach. The bathroom is not, even if the unit is called a “medicine cabinet”.
Why the bathroom is a bad idea
The heat and humidity of the shower degrade tablets and capsules, the pharmaceutical forms most sensitive to moisture. A medicine kept there can lose potency or spoil before the expiry date printed on it, with nothing visible from the outside.
There is a technical reason behind this. The stability studies used to set a medicine’s shelf life in Europe are run at 25 °C and 60% relative humidity. A bathroom with a daily shower exceeds that humidity several times a day. The kitchen has the same problem if the cupboard is above the sink or next to the hob.
Alternatives that do work: a chest of drawers, a closed box on a high shelf, the top shelf of a hallway cupboard. The only non negotiable is that it stays out of children’s reach.
What each phrase on the box means
Storage conditions are not free text: the EMA sets a closed catalogue of phrases and every European agency uses the same ones. That is why the box never says “store at room temperature” — that wording is expressly prohibited as imprecise.
| What the box says | What you have to do |
|---|---|
| No instruction at all | No special conditions needed. Somewhere cool and dry |
| “Do not store above 30 °C” | Keep away from direct heat sources. No fridge needed |
| “Do not store above 25 °C” | The coolest spot in the house. Still no fridge |
| “Store in a refrigerator” (2 °C to 8 °C) | Always in the fridge, never in the freezer |
| “Do not freeze” | Even in the fridge, keep away from the freezer and the back wall |
| “Store in the original package” | Don’t decant it into a pill organiser |
| “Keep the container tightly closed” | Close the bottle properly after every dose |
Two nuances that save trouble:
- “Do not refrigerate” appears on many medicines that don’t need cold. Putting them in the fridge just in case is not safer: it can alter them.
- “Store in a refrigerator” means the household fridge, not the freezer and not the shelf touching the back wall, where ice forms.
A heatwave does not ruin your medicine cupboard
This is the most repeated question in summer and the official answer is reassuring. According to the AEMPS, for medicines labelled below 25 °C or below 30 °C, briefly exceeding an ambient 40 °C does not affect their storage, for two reasons: in Spain those temperatures occur in short spells rather than all day, and the places medicines are kept indoors are cooler than the street.
More than that: medicines carrying no temperature instruction at all have been shown not to degrade after six months at 40 °C. That margin is deliberately generous.
What does have to be avoided is sustained, direct exposure:
- The boot or cabin of a car in the sun, where far higher temperatures are reached.
- A south facing windowsill.
- The car on a long August journey: the medication travels inside with you, not in the boot.
And take care with the soft pharmaceutical forms — creams, ointments, pessaries, suppositories — which are the most heat sensitive. The AEMPS rule is visual: if their appearance has changed when you open them, don’t use them.
The original packaging is not a whim
When the leaflet says “store in the original package”, it is saying the product is sensitive to light, to moisture or to both, and that the blister or bottle is part of that protection. Taking the tablets out to put them in a weekly organiser leaves them exposed.
Not every medicine carries that warning, so a pill organiser is perfectly valid for many treatments. But the decision isn’t made on the colour of the blister or on intuition: it’s made by reading the storage section of the leaflet, or by asking at the pharmacy.
Two habits that help:
- Keep the cardboard box, not just the blister. It carries the batch number, the expiry date and the storage conditions.
- Throw away the cotton wool in a bottle as soon as you open it: it absorbs moisture and then holds it inside.
How long it lasts once opened
The date printed on the box applies to the unopened container. The moment you open a bottle, a syrup or an eye drop, a second and shorter clock starts, stated in the leaflet, which often asks you to write the opening date on the box.
| Format | What to check |
|---|---|
| Tablets and capsules in a blister | The pack expiry date; each dose is individually protected |
| Multi-dose eye drops | The in-use shelf life given in the leaflet; often 28 days |
| Reconstituted antibiotic syrups | A specific number of days and, frequently, the fridge. The leaflet says which |
| Creams and ointments | Keep tightly closed; discard if the smell, colour or texture changes |
| Refrigerated injectables | Fridge between 2 °C and 8 °C unless stated otherwise |
When the in-use period expires there is usually product left in the container. That remainder is not used: it goes to the SIGRE point at any pharmacy, with its box and leaflet.
Signs something has spoiled
None of these replaces the expiry date, but if they appear, don’t use it:
- Tablets that are speckled, cracked, sticky or smell different — acetylsalicylic acid tablets smelling of vinegar are the classic example.
- Capsules that are soft, deformed or stuck together.
- Creams or ointments that have separated into two phases, with liquid on top or a grainy texture.
- Suppositories or pessaries that have melted and set again.
- Syrups or eye drops that are cloudy, with sediment or particles in suspension.
- Any container with a broken seal or a punctured blister.
When to ask
Talk to your pharmacist or doctor if:
- You have taken a medicine that was clearly altered — a change of colour, smell or texture — and you notice new symptoms.
- A medicine that should have been refrigerated has been out of the fridge for several hours or has frozen, especially an injectable.
- A treatment stops having its usual effect and you suspect it may have been stored badly.
- You are about to travel with refrigerated medication and need to know how to transport it.
- You are unsure whether your treatment can be moved to a pill organiser, or you take several and want to organise them.
- You need to dispose of expired or leftover medicines and don’t know what goes to the SIGRE point.
And if any unexpected reaction appears after taking something, don’t wait to see whether it passes: ask.
This information is general guidance only. It does not replace a consultation with your doctor or pharmacist. Sources: AEMPS — Medicines and heat, AEMPS — How to store medicines in summer (MUH 21/2019), EMA — Guideline on declaration of storage conditions (CPMP/QWP/609/96/Rev 2), MedlinePlus (NIH) — Storing your medicines, CIMA — AEMPS.