JMDigital, welcome to Dream Views!

The only experience I've had with pain medication was that it made my dreams very strange and unpleasant (but that was before I knew about lucid dreaming).

It is entirely possible that any type of medication could affect your sleep and therefore your dreams. Does the medication have a warning on the label regarding such things?

I would think that as long as the medication wasn't preventing you from dreaming (nor tampering with your dream recall).. then becoming lucid and controlling your dreams wouldn't be affected (at least not drastically).

I'm sorry I don't have more of an answer for you.. hopefully there are other members who will provide you with more insight.