Vomiting is a common side effect of the macrogol solutions used for WBI, which may hinder the effectiveness of the procedure for any indication. In cases of poisoning, the presence of vomiting prior to the procedure is not uncommon. It may be the result of administration of ipecac prior to the procedure, and/or a symptom of the poisoning itself. Overdoses of such drugs as aspirin and theophylline are likely to result in vomiting. Whenever vomiting occurs before or during WBI, the rate of the procedure may need to be slowed, alternatives considered, or an antiemetic such as metoclopramide administered.