Scientific studies on carcinogenicity were finally released in June 1993 revealing that feeding mice Ritalin, induced liver tumors including very rare and highly malignant cancers. These results were found at dosage levels close to those routinely prescribed for children. Animal tests are very good predictors of human health effects. In fact, the International Agency for Research on Cancer suggests that if a chemical is proven to cause cancer in animals, it should be treated as if it were cancer-causing in humans as well.
But the response by the FDA and the pharmaceutical company that makes Ritalin was predictable. The drug company wrote to 100,000 physicians informing them of the study showing that the drug caused cancer but said "It´s not enough of a signal that we think kids should be taken off the drug." They reassured the doctors that Ritalin is believed to be "safe and effective" by the FDA.
Does the public school system have the right to force parents to accept the drugging of their child? They do in America. But the drug´s side effects, according to vocal opponents of Ritalin, include: zombie-like behavior, growth suppression, behavior or thought disorders (exactly what it is supposed to treat) seizures; headaches, blurred vision, scalp hair loss, barking like a dog and babbling profanities. It can also result in mood swings, depression, drug dependence and inclination for criminal activity.