 [ Symptoms ] i have never got cold sores but when i kiss my girl friend i get them what is the reason behing this  i have never had cold sores in my life but my girl friend has got them 3 4 times and it seems they happen whenever we kiss what is the reason behind this   i feel very sorry for what is happening am i the curlprit [ Disease ] mild diarrhea is common with antibiotic use however a more serious form of diarrhea pseudomembranous colitis may rarely occur this may develop while you use the antibiotic or within several months after you stop using it contact your health care provider right away if stomach pain or cramps severe diarrhea or bloody stools occur do not treat diarrhea even with imodium without first checking with your doctor or health care provider