Oi, no doctor bashing!
Although, it is true that your pharmacist does get more training on drug interactions - we learn a few of the main ones, but otherwise it's a matter of checking each drug when you prescribe it - personally I always look it up if I haven't used the drug before and aren't sure if it will interact with something else the patient is taking. But unfortunately there are a lot of docs out there who think that they know it all because they've been around for a while, so they don't bother to check.. how annoying!
So listen to your pharmacist, and check with your doc - don't be afraid to get a second opinion! We all make mistakes - sometimes we genuinely forget about something or accidentally write down the wrong dosage or something.. it certainly happens! That's why it's good we have pharmacists to dispense the medicine.. part of their job is picking up our mistakes! I won't tell you how many scripts I made out with some sort of error that the pharmacist has called me about..
fortunately no drug interactions or dosing errors, but I usually make mistakes with how many repeats I can give or number of tablets and stuff.. but yeah..
Lost my point a little. Basically doctors are fallible, so it's good to check around if you aren't sure on something. Pharmacists can be a great source of information, but they aren't perfect either - if the doctor AND the pharmacist agree, that's probably okay then!