Medicines and prescriptions
What Does 'Protect From Excessive Moisture' Mean?
Excessive moisture · say it: ek-SES-iv MOYS-cherAlso written: protect from moisture, store in a dry place, keep dry
Short answer
On a medicine label, 'protect from excessive moisture' is a storage instruction: keep the product dry so it does not break down or lose strength.
What it means
Excessive moisture means too much dampness or humidity. On medicine labels it usually appears in the storage section, for example 'store at room temperature and protect from excessive moisture'. Many tablets, capsules and powders can absorb water from the air, which may make them crumble, stick together, change colour, or slowly lose strength.
The instruction is there to keep the medicine working as it should until its expiry date. This is why some bottles contain a small drying sachet (a desiccant) and why bathrooms, which are often warm and steamy, are not a good place to store medicines. Some medicines come in foil blister packs for the same reason and should be kept in the pack until used.
The phrase can also appear on skin products, such as some antifungal powders, which are designed for areas that stay moist, like skin folds. Read the whole sentence to see whether it is about storing the product or about where it is used.
Where you may see it
- The 'How Supplied / Storage and Handling' section of medicine labels
- Pharmacy bottle stickers ('Keep in a dry place')
- Packaging of medicines in blister packs or bottles with a desiccant
📄 How it looks on a report
Store at 20° to 25°C (68° to 77°F). Protect from excessive moisture. Keep container tightly closed.
🙅 What it does not mean
- It does not mean the medicine becomes dangerous the moment it gets slightly damp, but it may work less well.
- It does not mean you should put it in the fridge unless the label says so.
- The drying sachet in the bottle is not a medicine and should not be swallowed; keep it in the bottle.
🎯 Check yourself
Which of these is the right meaning of “Excessive moisture”?
🗒️ Questions to ask your doctor
🧾 Reports where you will see “Excessive moisture”
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💊 Medicines whose labels mention “Excessive moisture”
Plain-English explanations of each medicine, from its official FDA label.
- Carvedilol
A beta-blocker. The FDA lists it as both an alpha-adrenergic blocker and a beta-adrenergic blocker.
- Clopidogrel
A platelet inhibitor of the P2Y12 type (a thienopyridine). It is a blood thinner that keeps platelets from sticking together.
- Fexofenadine
an antihistamine, an allergy medicine sold over the counter
- Isoniazid
An antibacterial medicine of the antimycobacterial type, used against tuberculosis bacteria
- Montelukast
A leukotriene receptor antagonist, a medicine that blocks substances in the body called leukotrienes.
- Phenytoin
An anti-epileptic (seizure) medicine. The label describes it as related to barbiturates in chemical structure, and it belongs to the hydantoin group of medicines.
- Valsartan
An angiotensin II receptor blocker (ARB), a type of medicine used to treat high blood pressure and certain heart conditions
🔗 Read more from trusted sources
- “Excessive moisture” on MedlinePlus ↗
US National Library of Medicine
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General information about a medical word, not advice about your own results. Ask the clinician who ordered the test what it means for you.