For everyone looking to Kratom as painkiller, I recently was introduced to Kratom for my back injury from a few years ago. I tried pain pills hydrocodone etc and because of the risk of addiction had stayed away from them after a binge episode. Beware of your Kratom dosages! I had what is commonly called a double in the form of tea of the “green” strain (someone with more experience may enlighten me as to how many grams a “double” is) two times on an EMPTY stomach. My friend said I would be fine. I was vomiting the next day, severely weak and dehydrated! The effects were for sure as expected – a feeling of euphoria and general sense of well-being with mild painkilling effects. However the side effects were possibly the worst I’ve experienced in a while. Protect your liver and take the websites advice as to starting low and eating something before dosing! I had it again about three days after the vomiting episode with more attention paid to the right dosage and although the sense of euphoria was not as intense it was incredibly enjoyable and no side effects!