When Should I Give Ofloxacin And Duphalac To My Toddler Who Has Stomach Pain And Constipation With Tight, Small Stools For 2 Days?

My kid is 4 yrs 3 months old. Weighs.15 kg He is having stomach pain and from past 2 days has been passing tight stool v.less quantity. Seems like he is constipated. I have given him cyclopam 5 ml for now. I have oflaxacin with me. Kindly guide us how and when the doses needs to be scheduled. I also have duphalac with me. As he has been having issues of contipation from before.