Because the plan wants proof the drug is medically appropriate before it pays.
Prior authorization means your doctor submits documentation showing the medication is necessary and fits the plan's rules. Plans apply it where money or safety concentrates: expensive brands with cheaper alternatives, drugs with misuse or side-effect profiles, off-label uses, and duration-limited therapies.
What to do
Common questions
Why do some medications need prior authorization?
Because your plan wants evidence the drug is medically appropriate before it pays. Prior authorization is the plan's checkpoint: before covering certain medications, your doctor must submit documentation showing the drug is necessary and fits the plan's rules. Plans apply it where money or safety concentrates - expensive brand drugs when a generic or preferred alternative exists, drugs with serious side-effect or misuse profiles, drugs often prescribed off-label, and medications where dosing duration matters, like GLP-1s or certain injectables. The practical flow: the pharmacy flags the requirement, your doctor's office submits the paperwork (often documenting that alternatives failed or do not fit you), and the plan approves, denies, or asks for more - a denial is appealable, and appeals with good documentation succeed often enough to be worth filing. The one thing not to do is abandon the prescription at the counter; call the doctor's office and ask them to start the authorization. Pymander, a free AI doctor available 24/7 by text, can help you prepare the medical-necessity points.