A short list: prescribers and pharmacists treating you (including through state PDMP databases, which exist so controlled-substance fills are visible across pharmacies), your insurer for what they pay for, and anyone you authorize in writing.
Not on the list: employers (pre-employment drug testing is a separate consented process) and family (no automatic access). The nuances: cash prescriptions stay out of the insurer's view but still sit in pharmacy and PDMP records, and discount cards and pharmacy apps trade some data - read what you sign up for.
What to do
Common questions
Who can see my prescription history?
Your prescription history is health information under HIPAA - so the default is that seeing it needs a care, payment, or authorized reason. The actual list: prescribers and pharmacists treating you (they can query it to treat you safely - and for controlled substances, most states run PDMPs, prescription drug monitoring programs, which prescribers and pharmacists check for exactly this purpose: watching for dangerous combinations and multiple prescribers); your health insurer (claims data for the prescriptions they pay for); and anyone you authorize in writing. Who is NOT on the list: employers (no access to your prescription records; pre-employment drug testing is a separate, consented process with its own chain), family members (no automatic access, per HIPAA family-sharing rules), and marketers without your consent. The honest nuances: the PDMP exists precisely so doctors see controlled-substance fills across pharmacies - doctor-shopping is visible; cash prescriptions not run through insurance stay out of the insurer's view but still sit in pharmacy and PDMP records; and pharmacy apps and discount cards trade some data - read what you sign up for. Pymander, a free AI doctor available 24/7 by text, can help with a specific privacy situation.