Hello and welcome!
I am Dr. Thomas, board certified in internal medicine and integrative medicine and I can certainly help you with this. I'll either give you an answer or ask for some information; either way, make sure you use reply/reply to expert as needed until we are done before you rate the interaction.
Zithromax is an antibiotic with a particularly long half life.....which means it stays in your system longer than the average antibiotic.
IN fact, after your last pill, it will clear out in about 150 hours from that point.
This is why it can be used effectively with only 5 days of use, or even 3 days of use [the 3 pak], for certain infections.
The 5 pak is in fact adequate for treating pneumonia because of the long half life.
Let me know if you have further questions.
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