After taking Coenzyme Q10 upset stomach it is recommended to drink more warm boiled water to relieve symptoms, adjust the time of the next dose, preferably half an hour after meals. Coenzyme Q10 is a fat-soluble antioxidant, which not only can resist myocardial ischemia, nourish myocardium, protect the heart, prevent atherosclerosis, but also used in hepatitis, cancer adjuvant therapy. However, its side effects are mainly digestive symptoms, nausea, vomiting, abdominal distension and so on may occur, in addition, this drug is prohibited for those who are allergic to it to avoid causing allergic reactions, and renal insufficiency should be used with caution. Therefore, the best time to take Coenzyme Q10 is half an hour after meals, because the absorption of gastric fat-soluble substances is better after meals, and it can also reduce the stimulation of the drug on the gastrointestinal tract and reduce the appearance of uncomfortable symptoms. If nausea, vomiting, abdominal distension and other stomach discomfort occurs or symptoms such as skin redness, swelling, itching, breathing difficulties, etc., you need to pause taking the drug to immediately seek medical attention.