I m giving cypon to my twins & they start sleeping in the day time, is there any side affect?

I believe this medication contains an antihistamine that will cause drowsiness. Talk to your pharmacist to go over all the side effects with you. Be sure to measure liquid meds with a special spoon made for measuring liquid medications and not just any household flatware spoon as these do not measure a proper teaspoon especially when giving liquid medications to children. Your pharmacist should be able to provide you with a proper measuring device if you ask.