GHS hazard statement
H336: May cause drowsiness or dizziness
- H336
- Health hazards
- Warning
H336 means “May cause drowsiness or dizziness”. It is a GHS hazard statement for Specific target organ toxicity, single exposure; Narcotic effects (Category 3), shown with GHS07 under the signal word “Warning”.
Hazard class and category
| Hazard class | Category | Pictogram | Signal word | UN transport class |
|---|---|---|---|---|
| Specific target organ toxicity, single exposure; Narcotic effects | Category 3 |  | Warning | — |
What H336 means
Specific target organ toxicity after single exposure covers non-lethal effects on a specific organ system from one exposure. The GHS includes respiratory tract irritation and narcotic effects (drowsiness or dizziness) in this class.
One exposure can irritate the airways or cause drowsiness, dizziness or other effects on a target organ.
What to do
Avoid breathing dust, fumes, vapor or mist, use only outdoors or in a well-ventilated area, and move a person who is affected to fresh air. Call a poison center or doctor if the person feels unwell.
This is general guidance for the hazard class. The safety data sheet for your product always takes precedence.
Precautionary statements for H336
The GHS lists these precautionary statements for this hazard. Which ones appear on a label depends on the supplier's classification.
| Code | Statement |
|---|---|
| P261 | Avoid breathing dust/fume/gas/mist/vapors/spray. |
| P271 | Use only outdoors or in a well-ventilated area. |
| P304+P340 | IF INHALED: Remove person to fresh air and keep comfortable for breathing. |
| P319 | Get medical help if you feel unwell. |
| P403+P233 | Store in a well-ventilated place. Keep container tightly closed. |
| P405 | Store locked up. |
| P501 | Dispose of contents/container to ... |
Chemicals carrying H336
18 chemicals in our database. Classification comes from each chemical's primary GHS source, so a supplier's SDS may differ.
H336 frequently asked questions
What does H336 mean?
H336 means "May cause drowsiness or dizziness". It is a GHS hazard statement in the health hazards group, covering Specific target organ toxicity, single exposure; Narcotic effects (Category 3).
Which pictogram goes with H336?
H336 is shown with GHS07 (Exclamation Mark).
What signal word goes with H336?
The signal word for H336 is "Warning".
Which precautionary statements go with H336?
The GHS data lists 7 precautionary statements for H336, including P261, P271, P304+P340, P319, P403+P233. They cover prevention, response, storage and disposal. The full list is on this page.
Hazard statements describe the hazard of a classified substance or mixture. The classification of a specific product can differ, so use the supplier's SDS.
https://pubchem.ncbi.nlm.nih.gov/ghs/ghscode_10.txt (UN GHS Revision 10, retrieved 2026-10-12)