What happens if you swallow formaldehyde

May Though inhalation of the fumes can causes dizziness, swallowing High levels of formaldehyde can give you a headache and irritate your. Formaldehyde can be toxic, allergenic and carcinogenic. Evaporation of formaldehyde from formalin-treated cadavers in the anatomy dissection rooms can. COMBUSTIBLE LIQUID. May polymerize under certain conditions. VERY TOXIC. Fatal if inhaled. TOXIC following skin contact and/or if ingested. CORROSIVE. Causes.