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

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 for a product carrying H336, these are the precautionary statements it assigns, with combined statements written as one line:

Substances that carry H336

86 of the 4,228 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
SAME HAZARD CLASS:H335H370H371

Reference information, not legal or professional advice. Statement texts and allocations follow 29 CFR 1910.1200 Appendix C (the GHS as adopted by OSHA HazCom 2024) as implemented by our classification engine; the regulatory text and agency practice control. Claims last reviewed July 23, 2026.

The engine writes these for you.

When SDS HQ authors an SDS, it assigns the hazard statements, signal word, pictograms, and precautionary statements from these same tables — automatically, with the calculation shown.