Following are the mild side effects caused by Lovaza: Strange taste, Upset stomach, Burping, Gases, Diarrhoea, Nausea, Abdominal pain, Dysgeusia, Eructation, Dyspepsia, Rash, Vomiting, Ecchymosis, Epistaxis, Pruritus, Fatigue, Pharyngitis, Arthralgia Moderate side effects include: Constipation, Prolonged bleeding time, Increased ALT, Increased AST, Elevated hepatic enzymes, Hypercholesterolemia Severe side effects one might experience are: Coagulopathy, Anaphylactoid reactions, Atrial flutter, Atrial fibrillation To avoid occurrence of any possible side effects, ensure that you’re only administering the recommended amount.