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Thanks for your question.
There is a problem with use of post exposure prophylaxis of STD in such a way.An antibiotic cannot protect against all STD because there are many different types of STD and antibiotics have no effect against viral or protozoal STD.
Such antibiotic use is not recommended after protected intercourse.
If the intercourse was potentially unsafe due to condom breakage and status of partner regarding STD is not known you need to visit STD clinic and have yourself checked for STD.
There are recommendations for antibiotic administration in women who have been assaulted sexually and these include use of multiple agents which can be taken with prescription only.
Z pack is inadequate in protecting against all STD and if you feel that you are at risk you would be beter off visiting a STD clinic and have proper treatment and evaluation.
This is my initial answer.Please reply if you need any clarification.
The recommended treatment for gonorrhea is single shot therapy where one intramuscular injection of ceftriaxone 250mg intra muscular and 1 gram of Azithromycin PO is given.
Chlamydia can also be treated by single dose of 1 gm of azithromycin PO.
Treatment of syphilis requires 2 gm single dose of azithromycin PO.
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