are you trying to inject both these substances? how will you take the hydromorphone, how will you take the ativan?
if you have a tolerance to both benos and opiates and if you stick to low doses of ativan (0.5-2mg) with your diliaudd, you shoud be fine, however, everyone is different and some peple are more sensitive to certain drugs compared to other substances. alot of people OD, even when they have a tolerance to opiates/benzos, when they mix opiates with benzos. despite taking a clinically therapeutic/prescribed dose, people still fall and die.