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The average duration of treatment was longer than 12 months and the maximum dose of propranolol of 3 mg/kg/day was achieved after 3 to 5 months of treatment. Side effects occurred totally in 19 patients, with night anxiety and nightmares being the most common. After achieving the maximum dose of the drug later than recommended in the Recommendation of the Polish Haemangioma and Vascular Malformations Group criteria, there was no need for longer therapy, while the effectiveness of the treatment remained unchanged. Si