Okay so my boyfriend of 2 years now. Got this new job and since the job and the guy that he met he has been taking pain killers all the time and I mean like 4 or 5 everyday... and its changing him he is becoming moody towards me. Im not sure how to talk to him about this because every time that I bring it up he just denies it and then gets made at me for even thinking that but its been almost 2 months and he has taken them everyday.. I need help I'm not sure how I should talk to him about this... I need some ideas on how to bring it up and have him actually hear me out instead of instinly getting mad at me.
Thank you everyone this is urgent

You walk away and leave him alone. Have nothing to do with him. That will get his attention, and he can make a choice, you or the dope.

Be prepared though, he may choose the dope. If he does, don't go back!

Doesn't seem like he's putting much effort into repairing the relationship. Why be with someone who looks like he's given up on the relationship? If he can't provide you what you want, then walk away. He's not the one giving you a hard time. You're the one giving yourself a hard time. Quit torturing yourself. Find someone who will treat you the way you want.

This sounds like an addiction-and you can't make him quit,he has to make that choice himself.
I would consider leaving him to it.