PubMed · 7831733
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R B Dessau. 1995-01-09. [Azithromycin].. https://pubmed.ncbi.nlm.nih.gov/7831733/
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Since patients with cystic fibrosis are often treated with alpha dornase to reduce sputum viscosity, and because of preliminary reports of efficacy of long-term low-dose erythromycin therapy in chronic airway diseases, it is likely that alpha dornase and macrolides might be given together in such patients. A possible interaction between these drugs was therefore investigated. Using hyperchromic effect to quantify alpha dornase activity, a time- and dose-dependent inhibitory effect on human DNA hydrolysis has been observed for erythromycin, roxithromycin and azithromycin. Inhibitory doses 50% for alpha dornase were graphically determined. Azithromycin exhibited the strongest inhibitory effect.
The efficacy and safety of a 3-day course of azithromycin oral suspension (10 mg/kg of body weight once daily) were compared with those of penicillin V (50,000 U/kg/day in two divided doses) in children aged 3 to 12 years for the treatment of symptomatic pharyngitis caused by the group A beta-hemolytic streptococcus (GABHS). For the 154 evaluable patients, the original infecting strain of GABHS was eliminated at the end of follow-up (34 to 36 days after treatment started) from 67 (85.8%) of 78 penicillin-treated patients and 41 (53.9%) of 76 azithromycin-treated patients (P < 0.0001). Overall clinical success was achieved in 71 (91.0%) of 78 penicillin V-treated patients and 57 (75.0%) of 76 azithromycin-treated patients (P < 0.05). Potential drug-related adverse events were reported for 5.5 and 8.6% of the penicillin V- and azithromycin-treated patients, respectively (P = 0.6). In the present study, a once-daily (10 mg/kg), 3-day oral regimen of azithromycin was as safe as a 10-day course of penicillin but did not represent an effective alternative to penicillin for the treatment of GABHS pharyngitis, even for those children with azithromycin-susceptible strains.
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