#3 in the regimen looks like it is the victim of a pasting error. From the linked paper:

3.
If symptoms of severity (dyspnea, breathing difficulty, mild or moderate chest pain, with SpO2 >80%, heart rate <100 beats per minute at any time of the process):

-
Antihistamines + Azithromycin (see mild treatment management)

-
Levofloxacin 500 mg/12 h, up to 14 days of antibiotic treatment from diagnosis.

-
Mepifilin solution, 50 mg/8 h as a bronchodilator, until subjective improvement. Patients with previous lung disease (asthma or COPD) used their usual bronchodilators.

-
If the patient experienced increased breathing difficulty, prednisone 1 mg/kg/day divided into two doses until clinical improvement, and then it was slowly tapered down.