What happens if you mix Dilaudid 2mg with codeine 5mg?

It depends on how much of what you take. MDMA would naturally override the effects of Codeine being the strong stimulant it is. However Codeine being an opiate depressant(downer) can be dangerous when mixed with a stimulant(upper) such as MDMA. Mixing uppers and downers is not wise as this can likely cause your heart to go into cardiac arrest. One part of your brain is telling your heart to go faster, while the other part is telling it to slow down. Be careful.