Yeah pharmacists are SUPER helpful about stuff like that, particularly if there is one you see often that might be more familiar with your medications and such [though all pharmacists will be able to help you out- so if your pharmacy is closed but you need an answer at like midnight you can definitely call a 24 hour pharmacy and they will still be helpful].

A lot of the time if I have a fairly simple med question like that i will call the pharmacist before the doctor- since pharmacists work with medications and interactions and dosages, that is what they study and their knowledge base, they are more likely to be able to pull the knowledge from their brain than have to look it up or hmm and hah about it or consult someone else.

A good pharmacist is seriously like gold.
If you find one, treat them well.
Get to know them and their first name and make sure they recognize you!