If there isn't one where you live, several allow patients with valid prescriptions to order over the Internet. Be careful to follow medication instructions about eating or drinking. This process can be exceptionally trying for patients and families if it is not managed well. Ask your doctor if there are any symptoms you might expect during the withdrawal period. With children, non-medication strategies should be decided on in advance to deal with problem behaviors that may occur as drugs are tapered off.
Gradual withdrawal is almost always the best approach.
Patients should be carefully monitored for signs of trouble. In some cases, medication withdrawal may need to take place in a hospital setting. Such reports usually result in a stampede of parents and patients, all desperate to try the new drug. Unfortunately, several medications that have been tested for use in autism have eventually been found wanting. Some of these showed much promise initially.