A correctly prescribed medicine can lose its effectiveness or even become risky simply because it was kept in the wrong place: on a windowsill, in the bathroom or in the car's glove compartment in summer. The way you store medicines at home directly affects how well they work and how safe they remain until their expiry date. This guide explains in plain language what the instructions on the box mean (“store below 25 °C”, “keep refrigerated”), why the bathroom is the worst possible cabinet, and how to handle sensitive forms such as insulin, drops or antibiotics reconstituted at the pharmacy.
Why it matters where you keep your medicines
Every medicine is tested in stability studies that establish for how long and under what conditions it retains its declared concentration and purity. Based on this data, the manufacturer writes a short sentence on the packaging such as “store at temperatures below 25 °C”. The way these conditions are declared is regulated at European level through a guideline issued by EMA (the European Medicines Agency), while in Romania the authority that approves package leaflets and summaries of product characteristics is ANMDMR (Romania's National Agency for Medicines and Medical Devices). Heat, humidity, light and air accelerate the degradation of the active substance: a tablet may crumble, a syrup may change colour, and a cream may separate. Sometimes degradation is visible, but most of the time the medicine looks normal even though it has lost potency — which is why you cannot rely on appearance alone.
The golden rule: keep the medicine in its original packaging, together with the package leaflet, until the moment you take it. The box and the blister protect it from light and humidity, and the leaflet tells you exactly how to read the storage recommendations. If you need help interpreting the leaflet, see our guide on how to read the package leaflet.
Temperature: what “below 25 °C” means and when refrigeration is needed
Most medicines are stored at room temperature, but “room temperature” does not mean just anything. The standard sentences on the packaging have precise meanings, in line with the EMA stability guideline:
| The wording on the box | What it means in practice |
|---|---|
| No special mention | Stable under normal conditions; still protect it from extreme heat and humidity. |
| Store below 30 °C | Avoid heat sources; in summer, an unventilated flat can exceed this value. |
| Store below 25 °C | Controlled room temperature; keep away from radiators, the stove and sunny windows. |
| Store in a refrigerator (2–8 °C) | In the fridge, on a middle shelf, NOT in the door and NOT against the back wall. |
| Do not freeze | Freezing irreversibly destroys insulins and many biological products. |
A few practical rules for the fridge: the correct temperature for medicines is between 2 and 8 °C. The fridge door fluctuates too much every time it is opened, and the area at the back can freeze — both are unsuitable. Use a middle shelf and, for peace of mind, a cheap fridge thermometer. Never put medicines in the freezer “to cool them down faster”. And if a box that needs to be kept cold has been left at room temperature for a few hours, do not throw it away automatically — ask your pharmacist, because many products have a limited tolerance outside the fridge.
Humidity: why the bathroom and the kitchen are the worst places
Paradoxically, the “medicine cabinet” in the bathroom is exactly the place where medicines should not be kept. Steam from the shower creates high humidity and large temperature swings, which degrade tablets and especially effervescent forms. Acetylsalicylic acid (for example Aspenter, Aspirin) breaks down in the presence of moisture, and effervescent tablets containing paracetamol or vitamin C quickly lose their quality if the tube is left open. The kitchen has the same problem: heat from the stove and steam from cooking.
A few recommendations against humidity:
- Keep medicines in a cabinet in the bedroom or in a cool, dry hallway, away from sunlight.
- Do not remove tablets from the blister “a day in advance”; the foil protects against humidity and marks the dose.
- Do not throw away the silica gel sachet from tablet bottles — it absorbs moisture (but it is not edible).
- Close tubes and bottles tightly immediately after use.
Light: the silent enemy
Light, especially direct sunlight, breaks down certain active substances. Never leave medicines on the windowsill, on the car dashboard or on a table exposed to the sun. A classic example is sublingual nitroglycerin in tablet form, sensitive to light and air: it is kept in its original, tightly closed container and replaced periodically as stated in the leaflet. (In Romania, sublingual Nitromint is available as a spray; Nitromint Retard tablets are oral, prolonged-release, and are not used during an attack.) The cardboard box and the brown bottles are not a design whim — they are a real barrier against light, one more reason not to transfer tablets into transparent organiser-type boxes except for the daily dose.
PAO: how long you can use a product AFTER opening it
The expiry date on the box applies to the sealed product. Once opened, many pharmaceutical forms have a much shorter “period after opening” (PAO), because they come into contact with air and microbes. This duration is written in the leaflet; check it every time, and for products with a short PAO write the opening date on the packaging with a marker.
| Pharmaceutical form | General rule after opening | Note |
|---|---|---|
| Multidose eye drops / eye ointments | Frequently 28 days (4 weeks) | Check the leaflet; preservative-free single-dose vials are discarded immediately after use. |
| Nasal drops, nasal spray | Usually a few weeks after opening | Do not share the same bottle with other family members. |
| Syrups, oral suspensions | Variable; typically a few weeks | Some are kept refrigerated after opening — read the label. |
| Insulin in use (pen/cartridge) | Generally ~28 days at room temperature | The exact duration differs from one product to another; follow the leaflet. |
For eye drops, clinical guidelines such as BNF and NICE recommend, as a practical rule, discarding them 4 weeks after opening, precisely to avoid contamination. Do not rely on the date printed on the box if the bottle has been open for longer.
Sensitive forms: insulins, reconstituted antibiotics, suppositories
Certain forms need special attention. Here are the most common situations you encounter in Romanian pharmacies (Catena, Dona, Help Net, Dr.Max, Farmacia Tei):
| INN | Class / form | Commercial examples (RO) | How to store |
|---|---|---|---|
| Insulin glargine / aspart / lispro | Injectable antidiabetic | Lantus, Toujeo, NovoRapid, Humalog | Unopened: refrigerator 2–8 °C, do NOT freeze. In use: at room temperature, as stated in the leaflet. |
| Amoxicillin / amoxicillin + clavulanic acid | Antibiotic reconstituted suspension | Ospamox, Augmentin (suspension) | After preparation with water, refrigerate; use within a few days (see the leaflet), then discard the rest. |
| Glycerol / paracetamol | Suppositories | Glycerin suppositories, Eferalgan suppositories | In a cool place, frequently below 25 °C; in summer they can be kept in the fridge so they do not soften. |
| Levothyroxine | Thyroid hormone | Euthyrox, L-Thyroxin | Sensitive to heat and humidity; keep in the blister, as stated on the box. |
| Probiotic strains | Probiotics | varies by product | Some are kept refrigerated, others at room temperature — check the label. |
Two details that matter: liquid antibiotics prepared at the pharmacy (reconstituted suspensions) are valid for only a few days after the water is added and are usually kept refrigerated; do not keep them “for next time”. In addition, if a pharmacy tells you that a product is temporarily out of stock, do not buy large quantities “to stockpile” from other sources just to avoid a gap — first read about medicines with limited stock and ask the pharmacist for the suitable alternative. The recommendations of the World Health Organization (WHO) stress that correct storage, especially of heat-sensitive products such as insulins and vaccines, is essential for effectiveness.
Out of reach of children — and pets
Accidental poisonings in children are among the most common domestic emergencies. A few simple measures dramatically reduce the risk:
- Keep all medicines in a cabinet that locks or, at the very least, up high, out of children's sight and reach.
- Never call a medicine “a sweet” or “candy” to persuade a child to take it.
- Do not leave blisters on the nightstand, especially cardiac, antidiabetic or paracetamol products — an overdose can be serious.
- Check the “child-resistant” closure of the bottles and close it completely after each use.
In case of accidental swallowing, call 112 immediately or contact a 24-hour pharmacy for guidance. To quickly find an open unit, use the map of 24-hour on-call pharmacies.
Transport and travel
In a car, the temperature in the cabin can exceed 50 °C in summer, and the glove compartment is even hotter — a disastrous place for any medicine, especially for insulins. In winter, the opposite risk is freezing. Never leave medicines in a car parked in the sun.
- On a plane, keep essential medicines in your hand luggage, not in the hold (where they can freeze), together with the leaflet and, if necessary, a letter from your doctor.
- For products that require cold storage (insulins), use an insulated bag with a cooling element, but avoid direct contact with the ice so you do not freeze the product.
- Check the expiry date before leaving and take a sufficient reserve for the entire duration of the trip.
Before any trip, put together a well-planned travel kit. And if you buy medicines from unknown sources while away, make sure they are genuine — see how to check the authenticity of a medicine.
What to do with expired or degraded medicines
Do not keep old boxes “as a reserve” and do not take medicines that have changed in appearance, smell or colour, even if the date seems fine. Expired medicines must not be thrown in household rubbish or down the toilet. Since 2024, the official collection points for the public are set up by health facilities (hospitals) that provide spaces accessible to the public; some pharmacies still accept returns, but not all do. Ask the pharmacy or hospital in your area where you can correctly hand in pharmaceutical waste. You can find more details on correct disposal in the guide on expired medicines.
Quick storage checklist
- Keep everything in the original packaging, with the leaflet, until you take it.
- A dry, cool place, away from the sun — bedroom or hallway, NOT the bathroom or kitchen.
- Respect the temperature wording: below 25 °C, below 30 °C or refrigerator 2–8 °C.
- Fridge = middle shelf, not the door, not the freezer.
- Note the opening date for drops, syrups and insulins (the PAO rule).
- Out of reach of children, locked or up high.
- Do not transport medicines in the car's glove compartment.
- For any uncertainty about storage, ask your doctor or pharmacist.
Storing medicines correctly is not a formality but part of the treatment itself. Whenever you have the slightest doubt — a product accidentally left out of the fridge, a syrup that has been open too long, or a box that looks “odd” — do not improvise: ask the pharmacist or doctor, who can tell you whether the product can still be used safely.