Bertie Wooster is on a month of doxycycline, and after 10 days, it's starting to upset his tummy -- he threw up both dinner and breakfast yesterday. I'm sure the antibiotic is killing off his stomach flora, and adding to his nausea, so would like to give him something to help get them back, but dairy products are out (they interfere with the workings of the drug). Is there something else with active cultures I could give him? He's got 2 weeks of pills left to take, poor guy.