I'd take about half you'd normally do on the codeine, and 300 on the DXM. Note that I have weird ass opiate receptors, the first time I did opes ever, I took 50 mg of oxycodone, and just felt a little sleepy. When I take 15 mg of oxycodone with a bottle of tussin, after experimenting a little, and raising my tolerance, I feel like I'm in heaven. I can barely walk, but I love to run and jump and skip, because you don't feel the ground when you hit it, it just goes so smooth. It does have a really heavy DXM flavor to it, so if you aren't into that, you'd use waaay less dxm, maybe like 75-100 mg. Just be careful if you do a high dose of opes, or add in the benzos, because you want to keep breathing. Sorry if I'm ranting, I'm stimming now, so it's hard not to.