Second, the efficacy of azithromycin in a 2 g dose for gonorrhea depends on taking the entire
dose at once. Taking a second 1 g
dose a day later will be no more effective.
Finally, in the very unlikely chance you also have gonorrhea, 1 g of azithromycin probably would sufficient, over 90% reliable. The higher dose is recommended more as a safety factor, not because it's all that much more effective.