Azithromycin
"Girlfriend was told she had it so my doctor said she was going to give me the antibiotics anyways.   2 500MG pills.  I had a huge Mexican dinner and took the pills after.  She said she felt sick after taking hers and I said I'll be fine because of my stomach of steel..  1 hour later. Puked my brains out and I feel like a new man.  No cramps.... yet.  And no diarrhea either. But I have I digestive system of steel!  Hopefully..."