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Impact of Azithromycin on Forsythiaside Pharmacokinetics in Rats: A Population Modeling Method.
Jing-Chen Tian1,2, Xuan-Ling Zhang3, Jian-Rong Cui4
1Department of Pharmacy, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100070, China.
Combining forsythiaside with azithromycin increases drug exposure and antiviral activity. This interaction suggests lower azithromycin doses may be effective for treating pediatric pneumonia.
Area of Science:
- Pharmacology
- Pharmacokinetics
- Traditional Chinese Medicine
Background:
- Lianhuaqingwen and Shuanghuanglian are used for COVID-19 and pediatric pneumonia in China.
- Forsythiaside is the active component in these traditional medicines.
- Combination therapy with azithromycin is common but requires pharmacokinetic understanding.
Purpose of the Study:
- To investigate the pharmacokinetic interaction between forsythiaside and azithromycin.
- To determine if co-administration affects forsythiaside's in vivo behavior.
Main Methods:
- Twelve male Sprague-Dawley rats were divided into experimental (forsythiaside + azithromycin) and control (forsythiaside only) groups.
- Plasma forsythiaside concentrations were measured using HPLC-UV.
- Non-compartmental and population pharmacokinetic analyses were performed.
Main Results:
- Co-administration with azithromycin significantly decreased forsythiaside clearance.
- The area under the curve and half-life of forsythiaside increased significantly.
- The one-compartment model accurately described forsythiaside's in vivo behavior.
Conclusions:
- Azithromycin significantly reduces forsythiaside clearance, increasing drug exposure.
- This interaction allows for potentially lower azithromycin doses to achieve therapeutic forsythiaside concentrations for antiviral and antibacterial effects.
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