A precautionary statement is a standardized phrase on a product label that tells you how to safely handle, store, dispose of, or respond to exposure from a hazardous substance. You’ll find these statements on everything from industrial chemicals in the workplace to household cleaners under your kitchen sink. They’re distinct from hazard statements, which describe what a substance can do to you. Precautionary statements tell you what to do about it.
How Precautionary Statements Work
Precautionary statements follow a global classification system called the Globally Harmonized System (GHS), which standardizes chemical safety communication across countries. Under GHS, every classified hazardous chemical must carry a label that includes a signal word, hazard statements, pictograms, and precautionary statements. The precautionary statements are organized into four categories:
- Prevention: steps to avoid exposure or accidents in the first place, such as “Wear protective gloves” or “Keep away from heat, sparks, and open flame.”
- Response: what to do if exposure or an accident occurs, such as “IF SWALLOWED: Immediately call a poison center” or “IF ON SKIN: Get medical help.”
- Storage: how to keep the product safely, such as “Store in a well-ventilated place” or “Keep cool.”
- Disposal: how to get rid of the product or its container safely.
Each precautionary statement is assigned a P-code (like P201, P310, etc.) that corresponds to a specific standardized phrase. Manufacturers don’t write these phrases from scratch. They select the ones that match their product’s hazard classification.
Precautionary vs. Hazard Statements
These two types of statements appear on the same label but serve different purposes. A hazard statement describes the nature of the danger: “Causes serious eye damage” or “Highly flammable liquid and vapor.” A precautionary statement describes what you should do to minimize or prevent harm from that danger. Think of hazard statements as the “what could go wrong” and precautionary statements as the “here’s how to stay safe.”
Signal Words Set the Severity Level
Every hazardous chemical label also carries one of two signal words: “Danger” or “Warning.” Danger indicates a more severe hazard, while Warning flags a less severe one. Only one signal word appears on a label, no matter how many hazards a chemical poses. If any single hazard qualifies for Danger, that’s the word that goes on the label. The same logic applies to precautionary statements: when a chemical has multiple hazards with similar precautionary phrases, the most stringent version is the one that must appear.
Flexibility in the Phrasing
Precautionary statements have a core phrase that must appear on the label, but the system allows some flexibility. When a statement includes options separated by slashes, the manufacturer chooses the most relevant one. For example, “Wear protective gloves/protective clothing/eye protection/face protection” could appear on a label simply as “Wear eye protection” if that’s the appropriate precaution for that product’s hazards. Similarly, when a statement includes ellipses (…), it signals that additional conditions may need to be specified by the manufacturer based on the product.
Precautionary Statements on Household Products
You don’t need to work in a lab or factory to encounter precautionary statements. The Federal Hazardous Substances Act requires precautionary labeling on hazardous household products sold to consumers. Labels on items like oven cleaners, paint thinners, and certain adhesives must include precautionary measures describing actions to follow or avoid, first-aid instructions when appropriate, handling and storage instructions for products that need special care, and the familiar “Keep out of reach of children” warning. The signal words for consumer products expand slightly beyond the GHS system to include POISON, DANGER, WARNING, and CAUTION.
Consumer product labels must display the signal word and principal hazard statements on the main panel you see on a shelf. If there isn’t room for all the precautionary details on that panel, the label must at least instruct you to read the cautionary material printed elsewhere on the packaging.
Precautionary Statements in Drug Labeling
Prescription medications use a related but separate framework. The FDA requires a “Warnings and Precautions” section on professional drug labels that covers clinically significant adverse reactions (especially those that are potentially fatal, serious even if rare, or preventable with proper use), safety hazards from drug interactions, limitations on how the drug should be used, and what steps to take if problems arise. This section is written primarily for healthcare providers rather than patients, but it shapes the safety information that eventually reaches you through pharmacy handouts and patient guides.
What’s Changing in 2025
The GHS system is periodically updated. The most recent revision (Rev. 11, published in 2025) marked a number of older P-codes as obsolete, consolidating and streamlining the list. Phrases like “Obtain special instructions before use” (P201) and “Get medical advice/attention” (P313) have been retired or merged into updated codes. If you’re referencing a Safety Data Sheet or label that hasn’t been updated recently, some of the P-codes on it may no longer match the current standard, though the underlying safety guidance remains similar.
Where to Find Precautionary Statements
On a workplace chemical, precautionary statements appear in two places: directly on the product label and in Section 2 of the Safety Data Sheet (SDS) that accompanies the product. The label gives you the essentials at a glance. The SDS provides the full set of precautionary statements along with detailed hazard information, exposure controls, and emergency procedures. If you’re ever unsure about how to handle a product, the SDS is the most complete reference available.