I was recently prescribed Zithromax to clear chlamydia.. I was told to take 4x250mg capsules in one go before food, and was also told not to have intercourse for 7days.. I was also told that if no vomiting had occurred within 3days of taking it it would be all clear and no need to return.. I have never had this ur chlamydia before so am worried and confused. How do I know it has worked? Is 7days long enough before intercourse? And do I need to be rescreened? Thankyou