I've been taking Doxycycline for about a month now. It seems to be helping my acne pretty good so far. I haven't had any nausea, vomitting, stomach pain or dizziness. Although, if not taken with a full glass of water this med will definately make you feel as though it has become stuck in your throat. I just now figured out why. I kept thinking I was just swallowing it wrong, and it felt like it had gotten stuck, and it gave me terrible heart burn that wasn't soothed by antacids. It's been much better now that I drink lot's of water when I take it. Make sure to drink plenty of water with this drug!