H336 — May cause drowsiness or dizziness
The GHS hazard statement for specific target organ toxicity, single exposure, category 3 (narcotic effects). Here is what it means, the label elements that travel with it, and the substances that carry it.
At a glance
| Official statement | May cause drowsiness or dizziness. |
| Hazard class | Specific target organ toxicity, single exposure |
| Category | Category 3 (narcotic effects) |
| Signal word | Warning |
| Pictogram |  GHS07 — Exclamation mark |
What it means
Effects on a specific organ or body system from a single exposure. Categories 1 and 2 cover significant organ damage (proven or presumed vs. suspected); Category 3 covers transient effects — airway irritation or drowsiness/dizziness — that pass after exposure ends.
Precautionary statements paired with H336
When the engine writes SDS Section 2 or a container label for a product carrying H336, these are the P-codes it assigns, in the official Annex 3 groups:
| Prevention | P261 | Avoid breathing dust/fume/gas/mist/vapors/spray. |
| P271 | Use only outdoors or in a well-ventilated area. | |
| Response | P304 | IF INHALED: |
| P312 | Call a POISON CENTER or doctor if you feel unwell. | |
| P340 | Remove person to fresh air and keep comfortable for breathing. | |
| Storage | P403 | Store in a well-ventilated place. |
| P405 | Store locked up. | |
| Disposal | P501 | Dispose of contents/container in accordance with local/regional/national/international regulations. |
Substances that carry H336
86 of the 4,225 substances in our database carry H336 when classified in pure form — recognizable examples:
- Acetone — CAS 67-64-1
- Isopropanol (2-propanol) — CAS 67-63-0
- toluene — CAS 108-88-3
- butanone — CAS 78-93-3
The engine writes these for you.
When SDS HQ authors an SDS or a container label, it assigns the hazard statements, signal word, pictograms, and precautionary statements from these same tables — automatically, with the calculation shown.