Do people use needles taking methadone?

No, as long as the dose they are prescribed is correct. However if the dose is to high for to long a person can become over medicated. Symptoms include lethargy, sleepiness, slurring speech, difficulty waking up in the morning, as well as others. Many methadone clinics are privately run which can create ethical issues for providers who may or may not be vigilant in keeping track of patients dose and effects. many people prescribed maintenance doses may not even be aware they are being over medicated, this can cause problems with other medications and activities such as drinking, which is to be avoided. The biggest thing to look out for is the taking of Benzodiazepines which can cause many problems, including death. Usually clinics may refuse service if someone is already taking Benzodiazepines. Hope this helps answer your question a little :)