Aim: Identification of age-specific drug intolerance. Materials and methods: The study was conducted over the period from 2017 to 2020 and included 200 outpatient medical history forms of people diagnosed as having an unspecified pathological reaction to a drug or medication. All drug reactions are reported by patients own statements and were allocated to dichotomous variables. The results were analyzed by nonparametric statistics. Results: Three groups of patients: 18-44 years (n=49); 45-60 years (n=60); 61 and over (n=91). The odds of incomprehensible reactions were 2.2 times higher in patients in group 3 than in patients in the other groups. Group 3 patients were 12 times more likely to have an itchy reaction to medications than patients in the other groups. Group 1 patients were 3 times more likely to have urticaria than patients in groups 2 and 3. The odds of drug intolerance to ACE inhibitors were 2.6 times higher in group 3 patients than in patients in other groups. When comparing clinical manifestations of drug intolerance to penicillin- and cephalosporin-type antibiotics, no significant differences were found in all patients. The presence of allergies and somatic pathology of 3 or more systems did not significantly affect the possibility of reactions of varying severity to 3 or more drugs in these groups. Conclusions: Patients age has no effect on the possibility of reactions to certain groups of drugs. The exception was ACE inhibitors, which is most likely due to the higher frequency of prescribing antihypertensive therapy in patients in this age group. The aggravation of clinical manifestations and the occurrence of polypharmacy are not associated with age and comorbid background. It should be noted that correlation between age and non-life-threatening clinical manifestations of drug intolerance was revealed, which indicates the absence of reliable effect of age on the possibility of anaphylactic shock or angioedema.
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