Actually, what's "not getting noticed" is the article on antibiotics that is in the Article Database, where the penicillin dosages have been listed for you.
If you would take the time to read said article, and realize that different drugs have different dosages and frequencies ... and if you further noticed that the dosages and frequencies of both Procaine and Benzathine are listed ... but not together ... you would still have a basic, general idea of what to do.
If you bought a particular product that contains a mix, does it not have a package insert label, indicating the dosage/frequency? That would be what I would use
I personally have never bought/used this mix, but it shouldn't be too much trouble to find out.