If a person has been poisoned with formaldehyde vapors, then he must be urgently taken out into the street, to ensure the flow of clean air. It is imperative to moisten a cotton pad or napkin in ammonia and bring it to the victim's nose. The ammonia solution will react with formaldehyde, resulting in the transformation of the toxic substance into a non-toxic compound - urotropine.
If formalin is taken internally, then it is not allowed to wash the stomach before the arrival of the ambulance. The victim should drink as much clean water as possible. The antidote can be added to the drink in the form of ammonia-anise drops.
In case of toxic damage to the organs of vision, they are washed with warm clean water, after which a few drops of novocaine (solution of 0.5%) are dripped into each eye.
If the skin is damaged, then they are washed well, dried and moistened with 5-10% ammonia solution (ammonia). 
Medicines that a doctor may prescribe
Severe formaldehyde poisoning can be accompanied by severe symptoms and are often complicated, so it is very important to quickly begin treatment of intoxication. At the first suspicion of poisoning, you should immediately call an ambulance.
If breathing disorders are recorded in the victim, then respiratory analeptics are prescribed - drugs that stimulate the respiratory and vasomotor center:
- Lobelin - administered as intramuscular or intravenous (slow) injections of 0.3-1 ml of a 1% solution. In childhood, the dosage is 0.1-0.3 ml. Side effects can appear in case of an overdose of the drug and consist in the excitation of the vomiting center, respiratory depression.
- Cititon - injected both intramuscularly and intravenously, 0.5-1 ml. Children - from 0.1 to 0.5 ml, depending on age. Among the most likely side symptoms when using the drug are bradycardia, nausea, vomiting. With pulmonary edema and internal bleeding, Cytiton is not prescribed.
Additionally, measures are taken to prevent laryngeal edema. 
If it is necessary to alleviate the state of psychomotor agitation, tranquilizers are used:
- Diazepam (Sibazon, Relanium) is taken orally at 2.5-10 mg 3-4 times a day. Possible side effects: drowsiness, apathy, dyspepsia, increased salivation. The drug is withdrawn gradually.
- Afobazol - taken orally, based on an average daily dosage of 30 mg. The duration of treatment is up to one month. Possible development of an allergic reaction, nausea, diarrhea. The drug is not prescribed for children under 18 years of age.
- Phenazepam - taken orally at 0.25-0.5 mg three times a day (the dosage can be increased at the discretion of the doctor, provided that the patient is in a stationary environment under medical supervision). Possible side effects: muscle weakness, drowsiness, dizziness. In case of severe impairment of renal or hepatic function, Phenazepam is not prescribed.
If the patient is worried about severe pain, it is possible to prescribe narcotic analgesics, for example, Promedol or Omnopon.
For internal use of formalin in a hospital setting, the stomach is washed using a special probe with a wide lumen. Antidote for washing - 2% ammonium chloride or carbonate, or ammonium salt of acetic acid.