Azithromycin
"So I was diagnosed today with chlamydia and having been in a faithful relationship for nearly four years I was obviously freaked out I'd had it that long. But anyway, I look four 250mg in one go at around 7pm and had stomach pain after around half hour. It's now 9:30pm and I just had one of the worst episodes of diarrhoea in my life. I was worried this would affect the drug working but it seems to be normal so as long as it gets rid of the chlamydia it's a small price to pay. Food/drink - mocha 1 hour before taking, bolognese 1 hour after taking. Judging by these reviews it seems it doesn't matter if you eat or not you still could get side effects. Worth noting I didn't throw up but then I'm not a throwing up type person"