Almost every medicine sold in India is tested for stability at 30°C and 65% relative humidity — conditions that a Delhi May or a Kerala monsoon comfortably exceeds. Where a medicine sits in your home quietly decides how much of the printed strength you actually get. This guide covers the storage rules that matter, what expiry dates really promise, and how to dispose of what you no longer need.
What heat and humidity do
Heat speeds up the chemical breakdown of the active ingredient, so a tablet stored at 40°C can lose potency far faster than the shelf life suggests. Humidity is worse for solids: moisture drawn through a punctured blister softens tablets, makes capsules stick, and can cause them to crumble or discolour. Light degrades many molecules, which is why amber bottles and foil strips exist. Effervescent tablets, dispersible tablets and chewables are the most moisture-sensitive of all.
Where each type of medicine belongs
| Medicine | Store | Notes |
|---|---|---|
| Tablets and capsules | Cool, dry cupboard below 25-30°C | Keep in the original strip until the dose is taken — the foil blocks moisture and light. |
| Insulin (in use) | Room temperature, up to 28 days | An unopened vial or pen belongs in the fridge at 2-8°C. Never freeze it, and never leave it in a car. |
| Insulin (spare stock) | Refrigerator 2-8°C | Use a clay pot or insulated pouch during power cuts; discard if it has frozen or looks cloudy. |
| Syrups and suspensions | Room temperature unless labelled otherwise | Shake before use, cap tightly, and discard reconstituted antibiotics after the stated 7-14 days. |
| Eye and ear drops | As labelled; many need refrigeration | Discard 4 weeks after opening even if liquid remains — sterility is lost. |
| Inhalers | Room temperature, away from heat | Do not puncture or leave in direct sun; check the dose counter rather than shaking to guess. |
| Ointments and creams | Cool, dry place | Discard if the texture separates, hardens or smells changed. |
Reading expiry and batch details
Indian packs print the manufacturing date (MFD or MFG), the expiry date (EXP), a batch number (B.No.) and the maximum retail price. The expiry is the last date the manufacturer guarantees full potency and sterility in an unopened pack stored as directed. Two things change that promise: opening the pack, and storing it badly. A strip left in a bike's glove box for a summer may be well below label strength long before the printed date.
Keep the batch number. If a medicine is recalled or you need to report a suspected quality problem to the state drug controller or through the Pharmacovigilance Programme of India, the batch number is the first thing they ask for.
Signs a medicine has gone off
- Tablets that are chipped, discoloured, mottled or stuck together
- Capsules that have softened, swollen or leaked
- A syrup that has separated, thickened, changed colour or smells sour
- Cloudy or crystallised insulin, or any injectable with visible particles
- A cream that has split into oil and water layers
- Any unusual vinegar-like smell from aspirin tablets
A simple home medicine box
Use one opaque, lidded box in the coolest interior cupboard, out of children's reach. Keep everyday medicines in the original cartons so the dose instructions and expiry stay attached. Review the box every three months, pull anything expired, and keep a written list of long-term medicines — it is invaluable in an emergency and when checking for drug interactions.
Frequently asked questions
Is a medicine dangerous the day after its expiry date?
Most solid tablets lose potency gradually rather than becoming toxic, but the manufacturer only guarantees strength and sterility up to the printed date. Never use expired antibiotics, insulin, eye drops, nitroglycerine or any liquid or injectable.
Should medicines be kept in the fridge in Indian summers?
Only if the label says so. Most tablets need a cool, dry place below 25-30°C, and a fridge adds moisture that damages them. Insulin, some eye drops, certain syrups and vaccines genuinely need 2-8°C refrigeration.
Is the bathroom cabinet a bad place to store medicine?
Yes. Bathrooms and kitchen shelves near the stove are the two worst spots in an Indian home because of heat and steam. A closed cupboard in the coolest interior room is far better.
How long does a syrup last after opening?
Reconstituted antibiotic syrups usually last 7-14 days, and most opened liquids should be discarded within a month unless the label states otherwise. Write the opening date on the bottle.
How should unused medicines be disposed of?
Do not flush them or throw strips into open waste. Remove tablets from blisters, mix with used tea leaves or soil in a sealed bag before binning, and return unused antibiotics, cytotoxics or controlled drugs to a pharmacy take-back where available.