Treatment can consist of pharmacotherapy, psychotherapy or a combination of both as pharmacological treatments only treat the physiological effects of withdrawal. Pharmacotherapy does not address the cause of why the person began taking the drugs in the first place, which can lead to relapse.If a person is dependent on multiple drugs, then the one which is causing the most harm is treated first. E.g. if a person is dependent on both opiates and cannabis, then the opiate addiction will be treated first.