I thing a pharmacist can change the formulation (i.e. capsule to tablet or syringe to injector pen) or the denomination of the tablet, as long as they’re not changing the actual dosage, if the pharmacist is willing and had it in stock. But at my pharmacies, if they don’t have something in stock, they’ll have to order it and it generally arrived the following day. So as @deejayc mentioned, if they have advanced notice, that could work.

I just did the above—my dad needed tablets of another medication (coincidentally because we have to cut the tablet), but the nurse filling in at his doctor’s office made a mistake and sent the RX as capsules. The pharmacist offered to change it to tablets for me…however he didn’t have enough to fill the whole script, so he gave me a partial fill and I had to come back the next day to get the rest.

Or…I just asked my doctor to send an RX specifying the denomination I needed/wanted (I take 112.5 mg of a different medication, which is 4.5 of the 25 mg tablets. It’s super annoying to cut them, but that’s the dose my body tolerates.)

My dad is the one with PMR, and his rheumatologist just writes the RX for the smaller denominations and says for example: “Take 10 mg every morning or as directed by doctor.” But his insurance covers it without issue, and I know some people have said they’ve had problems with this.