There is a choice of two treatments. Either a single dose of azithromycin or a week long course of doxycycline.
Azithromycin is a simple one dose treatment that will eliminate the infection. It's very convenient and if taken with food is less likely to cause any unpleasant side-effects like nausea. It’s the treatment of choice if you’re allergic to Tetracyclines.
Doxycycline is just as effective but has to be taken for 7 days. It's less likely to cause side-effects and it’s an alternative if you’re allergic to Azithromycin, Erythromycin or Clarithromycin.