Twice on benzo's (intentional...and as it was only benzo's I was fine, although hospitalized...it's almost impossible to OD on JUST benzos)
Once on a cocktail (intentional...a liter of vodka, two bottles of wine, 4 cans of 8% cider, 10,000mg quetiapine, 1200mg diphenhydramine, 30 co-codamol...other stuff I don't really remember)
Once on Phenobarbital (intentional...I was in a coma on a ventilator in ICU for a week)
Three times on Spice (unintentional....each time I was offered it while homeless, out of drugs/alcohol and desperate to numb myself...all three times I had a massive grand mal seizure)
Oh and once (before I ever abuse drugs) shortly after being detoxed from alcohol I couldn't sleep and was prescribed codeine for pain. I remembered they made me sleepy (while an alcoholic, I was very naive when it came to drugs at the time with no experience but weed and little knowledge of any) so I just kept taking once every 10 minutes figuring I'd fall asleep. My whole body was red and burning and INDESCRIBABLY itchy. My face swelled up, especially around my eyes. My blood pressure dropped so low I was lying on the bathroom floor and couldn't even raise my head. Had to shout for my parents to call an ambulance. The paramedics said it was the lowest blood pressure they had ever seen on someone who was still conscious.
Weirdly, I also got very severe diarrhea.