CBD oil comes from the flowers of the cannabis plant and does not contain the psychoactive substance THC. It can be sold in the UK as a food supplement but not as a medicine. There is no evidence to support its use as a medicine. Unwanted side effects of cannabis can vary in severity from mildly uncomfortable to rare instances that may require medical attention. In this article you’ll find a comprehensive list of these side effects along with tips on how to relieve each symptom — and prevent them as much as possible. Use it to make more informed decisions about your cannabis use, and don’t hesitate to contact your doctor if you have any questions as to how cannabis may affect you. There is limited evidence on both the benefits and side effects of CBD oil. Since CBD oil is only available in Australia with a prescription, you’ll have the opportunity to talk to a doctor about side effects during your the harmful effects of marijuana consultation and during treatment.