Chlamydia Infection
"After taking two 500mg tablets to treat my STI, about 20 minutes after taking I became very very nauseated. Couldn&rsquo;t sleep, couldn&rsquo;t lie down. 
After having quite the bowel movement, I remained nauseous for another 30 mins. 
Skip ahead another few bouts of diarrhea and the nausea has subsided about two hours after initially taking. 
Although it does it&rsquo;s job, it will - even on a full stomach as suggested - make you feel like you wanna hurl. 
But, if I wasn&rsquo;t willing to go through this, I shouldn&rsquo;t have had irresponsible sex. 
To each their own."