Allergy to any of the drugs studied, including pentoxifylline Occurrence of any bleeding during the study (in the stomach, brain, eyes, ...) Drug intolerance or the occurrence of any severe side effects during treatment, such as gastrointestinal intolerance, does not respond to pre-determined measures of anti-acids... or the occurrence of skin drug reactions to the received treatment protocol and ... Being pregnant during the study Occurrence of heart attack and stroke during the study Drop in pressure below 10 mm Hg or instability of the patient's vital signs Require intubation during study or hospitalization in the ICU Increase in the severity of COVID-19 disease during the study so that the need for hospitalization in the ICU or the need to change the treatment protocol The use of a therapeutic drug other than the standard drug in this study

Allergy to any of the drugs studied, including pentoxifylline Occurrence of any bleeding during the study (in the stomach, brain, eyes, ...) Drug intolerance or the occurrence of any severe side effects during treatment, such as gastrointestinal intolerance, does not respond to pre-determined measures of anti-acids... or the occurrence of skin drug reactions to the received treatment protocol and ... Being pregnant during the study Occurrence of heart attack and stroke during the study Drop in pressure below 10 mm Hg or instability of the patient's vital signs Require intubation during study or hospitalization in the ICU Increase in the severity of COVID-19 disease during the study so that the need for hospitalization in the ICU or the need to change the treatment protocol The use of a therapeutic drug other than the standard drug in this study