http://www.medications.com/effect/view/42565 I have just started taking Lantus Solostar. I'm usually not allergic to medications, but this time I have developed diarrhea. The condition worsens soon after my meals, there is some amount of cramping throughout the day. Imodium helps, but only on the days Sun, 16 Aug 2009 17:37:29 -0400 http://www.medications.com/effect/view/42565?item=22286 How many units do you have to take every day ? Some diabetes medicine has diarrhea as a commom side effect. I would consult the doctor and see what can be done since you do not want to skip a dosage and create more problems for yourself. http://www.medications.com/effect/view/42565?item=22286