[sp332]

That sounds like Zithromax, aka a "Z-Pak".

[jcoby]

It could have been. Looking at the list that MaDeuce posted above Doxycycline sounds more familiar. I really don't remember though.

[lonelappde]

Brand name for azithromyclin, similar to doxycycline. Both are antibiotics used for a wide variety of conditions where bacteria are known or suspected.

[eigenloss]

Azithromycin and doxycycline are completely different chemicals; the former is a macrolide, the latter is a tetracycline. Both are used for Lyme (and various other infections).