I'm a cheap date.
I am blessed with getting the results I'm after with low doses. I also always take both thc and cbd, which helps them both work more effectively.
The little droppers I have are 25 drops per ml. So 9 drops is just under a third so its a 10 mg dose. Id say thats a medium size dose. High for me low for many.
Do you know what the oil is? Some absorb better than others.
Cannabinoids will help the opiates work better so you may want to consider starting a reduction plan.
I dont know if having a lot of opiates in your system hides the cannabis results, but someone will.
Oldbear, below is the oil I have. Also, I smoked my first joint ever last night, (1/3 gram of indica, at 16% THC) and it barely affected me at all... as in I really had to think about whether I was actually feeling anything at all! I'm confused. I would have thought that my first time smoking would have knocked me right off my feet, same with the oil. Sheesh!