A comparative analysis of two case histories showing the effects of COVID-19 and immunization with the Sputnik V vaccine on the dynamics of epilepsy is presented. The study was part of the "Epilepsy and COVID-19" research initiative in a cohort of patients with epilepsy divided into two groups: those experiencing COVID-19 and those immunized with vaccine against COVID-19. We present here a comparative analysis of two case histories: recurrence of seizures in COVID-19 in a young (male) patient and good tolerance of vaccine in an older (female) patient with comorbid pathology after surgical treatment of drug-resistant epilepsy. Patient K (age 32 years, male) had generalized genetic (idiopathic) epilepsy with remission of seizures for three years. On the background of mild COVID-19 the patient experienced recurrence of generalized tonic-clonic seizures with deterioration of electroencephalographic indicators. Patient F (age 59 years, female) had focal drug-resistant epilepsy with remission of seizures for three years following surgical treatment, with comorbid endocrine pathology. No side effects were seen on immunization with Sputnik V vaccine and clinical-electroencephalographic remission persisted. The results showed good tolerance of Sputnik V vaccine, with persisting remission of seizures after neurosurgical treatment of drug-resistant epilepsy in the older patient with comorbid pathology and the potential for recurrence of seizures in the young patient on the background of mild COVID-19. These results will help practicing physicians determine management tactics in epilepsy patients. Continuation of this research on the effects of COVID-19 disease and vaccination on the dynamics of epilepsy in a larger cohort is needed.