Dr Waldemar Szpak of Rainbow Oncology comments on this Medscape article. “Cannabis oil and other marijuana derived products have become very popular remedies for numerous diseases including cancer, despite a lack of solid scientific evidence for their claimed efficacy. It is extremely important that users of cannabis products discuss the potential toxic effects resulting from the use of cannabis, at the same times as other chronic medicines, with their doctor. There is a serious risk of accidental overdose or a possible loss of effect of chronic medication taken, if taken concurrently with marijuana, cannabis or cannabinoids.” – Dr Waldemar Szpak – Rainbow Oncology.