The most common side effects of C Heptin are nausea, fatigue, and headache. Most of these are temporary and usually resolve with time. Contact your doctor straight away if you are at all concerned about any of these side effects. Before taking this medicine, you should tell your doctor if you are pregnant, planning pregnancy or breastfeeding. You should tell your doctor if you have any kidney or liver diseases so that your doctor can prescribe a suitable dose for you.