I was prescribed doxycycline 100 mg mono for my vaginal infection in us and after taking a course got completely cured doctor advised not to take any milk or dairy products 2 hrs before and after the medicine was taken and it was followed now after 1.5 years the problem has recurred now we do not get doxycycline mono here but only with lactic acid can we take this medicine as we suspect la may be a dairy product? Pl advise by return thanks.