As the saying goes, “It’s medicine that’s poisonous”. This means that people have long recognized that drugs can both cure and cause disease. Drug abuse can lead to many diseases. Recently, Professor Franjo from Cornell University School of Medicine in New York found that drug abuse is also an important factor leading to the occurrence of cancer. Common drugs with carcinogenic effects include: 1. Antipyretic and analgesic drugs: if taken in excessive doses or for a long time, they can easily cause renal papillary necrosis or other kidney damage. The incidence of renal pelvis cancer in patients with chronic kidney disease is about 7 per 1,000, while the incidence of renal pelvis cancer or bladder cancer in patients who take antipyretic analgesic drugs for a long time and cause kidney damage is about 95 per 1,000, which is especially likely to happen in the elderly. 2.Chloramphenicol: including chloramphenicol tablets, injections and chloramphenicol eye drops, long-term application can lead to leukopenia, aplastic anemia and induce acute leukemia, and its latency period leading to blood cancer can be as long as seven years. When infants, pregnant women and the elderly take such drugs, they need more guidance from doctors to avoid accidents. 3.Anti-epileptic drugs: Medical research has found that pregnant women with epilepsy who take phenytoin sodium for a long time are prone to neurofibroblastoma in their newborns; long-term high-dose use of phenobarbital is prone to malignant brain tumors. 4, testosterone drugs: long-term application of male hormones in large quantities of methyltestosterone, dehydrotestosterone, testosterone enanthate treatment of aplastic anemia and other diseases, prone to cause hepatocellular carcinoma. 5. Alestrenol: Alestrenol, which is widely used in the treatment of gynecological diseases, prostate hypertrophy or prostate cancer, can induce ovarian cancer. The incidence of endometrial cancer is significantly increased in menopausal or postmenopausal women when this drug is used. Dr. Gustav of the University of Düsseldorf, Germany, found that some women with adenocarcinoma of the reproductive tract were closely related to their mothers’ heavy use of the drug during early pregnancy. 6.Lisdexamfetamine: Women who have been taking lisdexamfetamine for a long time, especially postmenopausal women, are prone to breast cancer, the incidence of which is three times higher than that of women in the same age group. 7. Other: certain toxic anticancer drugs and levamisole, which has been found to regulate human immune function in recent years, are prone to induce other tumors, or “second tumors”, if used improperly. In addition, oxytetracycline, chloroform, arsenic compounds, coal tar ointment and asbestos mineral herbs such as actinolite all have different degrees of carcinogenic effects. In order to prevent the occurrence of drug-derived cancer, the above-mentioned drugs with certain carcinogenic effects should, in principle, be used sparingly, and when they must be used, they should be used according to medical prescriptions and undergo relevant examinations in hospitals regularly; avoid long-term use of large doses, and when larger doses must be used, shorten the medication time as much as possible.