Irinotecan, or Irinotecan Hydrochloride for Injection, side effects usually last about 3 to 5 days. Irinotecan Hydrochloride for Injection is mainly used in the treatment of advanced colorectal cancer, patients will experience diarrhea, anorexia and other symptoms, intestinal obstruction and drug allergy is prohibited. Side effects usually last for about 3~5 days during patients’ adaptation to Irinotecan Hydrochloride for Injection, which is mainly used for the treatment of patients with advanced colorectal cancer. Patients will experience adverse reactions such as diarrhea, nausea, vomiting, dehydration, etc. A few patients will experience anorexia, constipation, abdominal pain, mucositis and other discomforts as soon as the drug is administered. It should be noted that patients suffering from intestinal obstruction should not use Irinotecan Hydrochloride for Injection, which may aggravate the patient’s constipation symptoms. It is prohibited for patients who are allergic to the drug components of Irinotecan to avoid the occurrence of dyspnea, shock and other uncomfortable symptoms. The side effects of Irinotecan Hydrochloride for Injection usually disappear in 3 to 5 days, and patients should take the medication as prescribed by the doctor. If the side effects persist, patients are advised to seek medical advice promptly.