These substances that you mention suboxone, bromocriptine.
They sounds like drugs.
If they are then you would be 100 percent better off by not taking any of it.
Drugs only do a few things-

#1 They make you sicker because they are poison to the body
#2 They only hide the problem that they are prescribed to fix.
#3 They always cause other problems in addition to what they were intended to hide.

I once knew a chiropractor who would have his new patients bring in all their bottles of prescriptions to him.
They would hand them to him usually in a plastic bag and the Dr. would take the bag, turn and drop the bag full of prescriptions into the trash bucket and say "you won't be needing those anymore".
He said they almost always would give a sigh of relief.
Deep down they all knew that stuff wasn't any good for them.
Drugs are poisons.
Fortunately we have Curezone. Its about educating instead of medicating.

Are you male or female? High prolactin in females is often associated with birthing and nursing. In men it is most often from a pituitary tumor, which is why they would want the scan.

Dopamine takes down prolactin provided there is not a pituitary tumor. Supplementation with tyrosine on an empty stomach 3 times daily will raise dopamine levels.

I had the same problem at one time and my prolactin level was through the roof. Apparently I had thrown it out of balance due to my consistent use of 5-Htp which can apparently increase prolactin levels. I stopped it, started using Tyrosine Daily as well as Vitex (Chaste tree berry) and my levels returned.

I've learned since that Vitex is probably best avoided by men, but in this situation it could be of some help temporarily. Best of all after the month passed I was back in normal range and I didn't have to go for an MRI or anything else that could potentially cause problems.