Practicing medicine is no longer simply prescribing the medications that we think are best for our patients. In our current times, there are many factors that go into the decision of what medication a patient will take.
Most insurance companies have their own formularies and rules about what medications they will cover. And these change frequently. It is impossible for doctors and pharmacies to stay on top of these because they are all very different. Even the databases we rely on to look these up are often out-dated. As a result, it often happens that a pharmacy calls about a prescription, asking the provider to either do a prior-authorization or to change it to another medication.
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