Azithromycin
"Got a positive test result text, went to get treatment that same afternoon with my partner. Both given 4 azithromycin tablets (1000mg) to take at once. Since taking them both of us have had nausea, stomach cramps, stomachs making funny gurgling noises and diarrhoea. This started roughly 2 hours after taking. Hoping they will pass soon, feeling sick is the worst :("