Is the single dose of azithromycin for chlamydia effective if you vomit 8 hours later?

It is important to take all medications as directed by your doctor. Vomiting within 8 hours of taking a single dose of azithromycin may reduce its effectiveness in treating chlamydia. If you vomit after taking azithromycin, you should contact your doctor to discuss whether you need to take an additional dose. It is also important to practice safe sex to prevent reinfection with chlamydia.