SHEET /m/dextromethorphan · PubChem CID 5360696 · CAS 125-71-3 · REV 2026.07
Dextromethorphan from source
C18H25NO · 271.4 g/mol
d-Methorphan · delta-Methorphan · Dextromorphan · Dextromethorfan
Also sold as Robitussin, Delsym from source
Morphinan antitussive and dissociative drug
Fig. 1 · 2D structure RDKit
CN1CC[C@@]23CCCC[C@@H]2[C@@H]1CC4=C3C=C(C=C4)OC
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported mouse oral LD50 for Dextromethorphan is 201 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
201 mg/kg · moderately toxic · LD50 mouse oral from source
The dose lens above scales this to a body weight.
1 more reported value
- 112 mg/kgLD50 · other · mouse