Key takeaways
Azithromycin (Zithromax) and penicillin V potassium (Penicillin VK) are both antibiotics used to treat bacterial infections, including strep throat and certain respiratory infections. However, they belong to different medication classes. Azithromycin is a macrolide antibiotic, while penicillin V potassium is a penicillin antibiotic. Azithromycin is typically taken once daily for 3 to 5 days, whereas penicillin V potassium is taken every 6 to 12 hours for 10 days. Both medications are availible as a generic and come in tablet and liquid forms. Both medications can cause side effects like diarrhea and nausea, but azithromycin may also lead to stomach pain and QT prolongation, a heart rhythm problem. Azithromycin can interact with medications like antiarrhythmics and statins, increasing the risk of heart rhythm problems and muscle issues, respectively. Both medications require a prescription and should be taken as directed by your healthcare professional.
