So is it really not about the medication? Is it really more about just talking to him? I don't say that to be accusatory, but perhaps you need to be honest with yourself about why you are really calling.

If the question about the med is minor side effect related, like someone else said, you can probably find the answer online (google is our friend) or in your packaging insert (which you can also find online). Again, if it is more serious, you really need to call the prescribing physician. Or, wait a bit and if you haven't heard back from the pharmacist, call back later, your message may have gotten lost in the shuffle of messages on his desk.