Summer damages medicines with heat. The monsoon damages them with water in the air — and unlike heat, humidity usually leaves visible evidence, which makes it easier to catch if you know what you are looking at.
Related reading: How to store medicines safely at home
Why this matters
Many tablets absorb moisture from the air readily. Once they do, they can swell, soften, crumble, stick together or begin to break down chemically. Capsule shells are gelatin and are especially affected — they turn soft, tacky or brittle depending on conditions. Powders and effervescent tablets clump.
What medical guidance says
What humidity does, form by form
- Uncoated tablets — soften, crumble or develop a mottled surface.
- Capsules — become soft and sticky, or dry and brittle, and may stick together.
- Effervescent and dispersible tablets — begin reacting in the tube; a partly fizzed tablet has already lost effect.
- Powders and granules for reconstitution — clump and cake.
- Sublingual tablets — particularly moisture-sensitive.
- Test strips, including blood glucose strips — readings can become unreliable, which is a safety issue in its own right.
Visible warning signs
Unlike heat damage, damp usually shows. Look for tablets that have changed texture or developed spots, capsules stuck together, powder that has caked solid, strips whose foil has lifted or blistered, cardboard cartons that feel soft or smell musty, and any visible discolouration or fungal growth.
A medicine showing any of these should not be taken on the assumption that it is probably fine. Ask your pharmacist.
The bathroom cabinet
It is the most common storage spot and the worst one at any time of year — every hot shower fills it with steam. During the monsoon it is a particularly poor choice. The kitchen is second worst, for the same reason.
Practical monsoon habits
- Keep the silica gel sachet inside every bottle. It is there specifically for this, and it is not packaging waste.
- Close bottle caps tightly and immediately, rather than leaving them loose on the shelf.
- Leave tablets in their sealed strip until the moment the dose is taken. Cutting a week of doses in advance exposes them all.
- Store the medicine cupboard’s contents in an airtight container for the wettest months.
- Choose an interior cupboard away from outside walls, which stay damp during long rain.
- Check for water ingress after heavy rain — a leak above a cupboard can ruin a whole shelf unnoticed.
- Keep glucose test strips tightly capped and never transfer them to another container.
- Do not store medicines on the floor or in a basement-level room during the monsoon.
Buy in smaller quantities during the monsoon if your storage is not reliably dry. A three-month supply sitting in a damp cupboard is a false economy.
When to consult a doctor
Ask your pharmacist before using any medicine that has changed texture, colour or smell, capsules that have stuck together, powder that has caked, a pack that has been rained on or submerged, or anything showing visible fungal growth.
Bring the pack with you. Never stop a prescribed medicine because you suspect damp damage — ask so a replacement can be arranged without interrupting treatment.
Frequently asked questions
- Can I dry out tablets that have gone soft?
- No. Once moisture has been absorbed, the chemical breakdown it may have started is not reversed by drying. A tablet that has softened or crumbled should be shown to your pharmacist rather than dried and used.
- Should I keep the silica gel sachet?
- Yes. It absorbs moisture and is one of the more effective protections during humid months. Leave it in the bottle. The cotton wool, by contrast, is usually better removed once opened, as it can hold moisture against the tablets.
- Is it safe to pre-cut a week of tablets into a pill organiser?
- It helps adherence but exposes every dose to the air for the whole week, which is a real drawback in the monsoon. If you use an organiser, choose one that seals well, keep it somewhere dry, and fill it for shorter periods during humid months.
- My blood glucose strips are giving odd readings in the rainy season. Why?
- Test strips are moisture-sensitive and can give unreliable readings once damp. Keep the vial tightly capped, never transfer strips to another container, and speak to your pharmacist if readings seem inconsistent.
References
- Guidance on storage conditions and stability of pharmaceutical products — World Health Organization (WHO)
- Good storage and distribution practices for medical products — World Health Organization (WHO)
- Consumer guidance on safe use and storage of medicines — Central Drugs Standard Control Organisation (CDSCO), Government of India