Well it just goes to show,doesn't it ? I may as well go with the flow,it saves argument. Cannabis/cocaine obviously doesn't alter the effects of medication.Must jot that down.
When ever I'm put on different meds, the doctor brings up my previous meds to make certain there won't be adverse reactions. NOTHING in life is 100% fail safe, but if we went with that, nothing would get done. No one would be prescribed, just in case. Whilst you may know those who have had unfortunate experiences, OR can give lists of those who have, from the media, it has to be remembered that the vast majority WILL be able to take -and thrive on- those meds you claim are dangerous.