Xylometazoline hydrochloride
The clinical picture of intoxication with imidazole derivatives can be diverse, as phases of stimulation may alternate with periods of suppression of the central nervous system and cardiovascular system. An overdose results mainly in central nervous effects: convulsions and coma, bradycardia, apnoea, hypertension and also hypotension.
Symptoms of CNS stimulation are anxiety, agitation, hallucinations and convulsions.
Symptoms of CNS suppression are decreased body temperature, lethargy, drowsiness and coma.
The following additional symptoms may occur: miosis, mydriasis, diaphoresis, fever, pallor, cyanosis, nausea, tachycardia, bradycardia, cardiac arrhythmia, cardiac arrest, hypertension, shock-like hypotension, pulmonary oedema, respiratory disorders and apnoea.
In cases of severe overdose, intensive inpatient treatment is indicated. The administration of medicinal charcoal (absorbent), sodium sulphate (laxative) or gastric lavage (in the case of large quantities) should be performed immediately, as xylometazoline can be rapidly absorbed. In order to lower blood pressure, a non-selective alpha-adrenergic blocking agent can be given.
Vasopressor agents are contraindicated. If necessary, the following measures should be taken: fever reduction, anti-convulsive therapy and oxygen inhalation.
Dexpanthenol
Pantothenic acid and its derivatives, such as dexpanthenol, have very low toxicity. No measures are required in cases of overdose.