Nausea, vomiting, and stomach bloating are some of the most common side effects of TriLyte® (polyethylene glycol electrolyte solution). In most cases, reactions to this product are minor, and they tend to go away fairly quickly; however, some side effects are much more serious. For example, vomiting bright red blood is a sign of a potentially dangerous problem. If this happens to you, contact your healthcare provider right away.
(Click TriLyte Side Effects to learn about other problems that can occur while taking this laxative. This article also explains why it's important to report anything that "just doesn't seem right" to your healthcare provider.)