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What Is The Difference Between An Open And Closed Formulary?

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Last updated on 7 min read

An open formulary lets you access a wide range of medications, while a closed formulary only covers drugs on a strict, pre-approved list to keep costs in check and ensure proper use.

What does an open formulary mean?

An open formulary is a drug list where every approved medication gets covered by your health plan or hospital, with no limits on access.

This setup gives both patients and doctors maximum flexibility—providers can prescribe any drug on the formulary without jumping through hoops. Open formularies show up most often in big health systems or insurance plans where cost control doesn’t mean sacrificing options. They usually drive up drug spending, but patients tend to love them because there are fewer hurdles to getting the meds they need. Healthcare.gov confirms this approach is standard in PPO plans, which already give you broader provider networks and fewer headaches.

What is a closed prescription?

A closed prescription is a medication order that only gets filled if the drug is on a restricted formulary list, often requiring prior authorization or step therapy first.

In a closed formulary setup, any drug not on the approved list isn’t covered—meaning you either pay full price or ask for an exception. The whole point? Push doctors and patients toward cost-effective treatments and cut wasteful spending. You’ll mostly see closed prescriptions in Medicare Part D plans and some employer health plans. Centers for Medicare & Medicaid Services (CMS) says these formularies help control drug costs without locking people out of treatments that actually work.

How do drugs get on a formulary?

Drugs land on a formulary after a pharmacy and therapeutics (P&T) committee reviews them for safety, effectiveness, cost, and clinical guidelines.

The process usually starts with a deep dive into clinical evidence and cost comparisons, then weighs whether the drug fills a real need. New drugs can squeeze in if they’re clearly better than what’s already available, while older or less useful options often get booted. These committees meet regularly to keep formularies current, especially when the FDA approves new meds or guidelines shift. American Society of Health-System Pharmacists (ASHP) stresses that the goal isn’t just to save money—it’s to balance real medical value with what patients and systems can afford.

What is hospital drug formulary?

A hospital drug formulary is a carefully chosen list of medications approved for use inside the hospital, picked by a team of doctors, pharmacists, and nurses to ensure safe, effective, and budget-smart care.

This list acts as the hospital’s go-to guide for prescribing and dispensing drugs, cutting down on errors and keeping inventory under control. Many hospitals split their formularies into tiers based on cost, availability, and how often the drugs get used. Joint Commission calls these formularies vital for maintaining high-quality care and meeting accreditation rules.

What is open prescription?

An open prescription is a digital or paper script that lets you fill your meds at any pharmacy without formulary restrictions or extra approval steps.

You’ll hear this term a lot in telemedicine or e-prescribing systems that verify prescriptions in real time. Unlike closed prescriptions, which might tie you to specific pharmacies or formularies, open scripts give you freedom. States with strong e-prescribing laws—like those following the DEA’s EPCS requirements—are pushing these hard. They’re convenient for patients and make prescription fraud a lot harder to pull off.

Who creates drug formulary?

A drug formulary is built and updated by a pharmacy and therapeutics (P&T) committee, made up of doctors, pharmacists, and other healthcare pros from different specialties.

This committee reports to the health plan, hospital, or pharmacy benefit manager (PBM) and decides which drugs make the cut. Their work includes digging through clinical trial data, cost analyses, and patient needs to set coverage rules. PBM Monitor says P&T committees are everywhere in managed care because they keep formularies aligned with the latest medical evidence and economic realities.

What does a closed formulary mean?

A closed formulary is a tight list of medications your health plan or hospital will cover, usually excluding anything not on the approved roster unless you get special permission.

The whole idea is to steer everyone toward cheaper, equally effective alternatives and keep spending under control. Closed formularies often come with step therapy rules—meaning you try and fail on a preferred drug before moving up to something pricier. You’ll find these in HMOs and Medicare Advantage plans. Kaiser Family Foundation (KFF) reports they can slice drug spending by up to 20% in some cases, though patients sometimes chafe at the limited choices.

What is an example of a closed door pharmacy?

A closed-door pharmacy is a specialty pharmacy that only serves institutional clients like nursing homes, hospitals, or long-term care facilities, not walk-in customers.

These pharmacies run under contracts with healthcare providers, focusing on bulk orders, unit-dose packaging, and strict compliance with institutional med rules. They’re not open to the public, but they’re critical for keeping patients in care settings supplied. National Association of Boards of Pharmacy (NABP) points out they follow the same regulations as retail pharmacies, just with extra oversight for institutional settings.

What happens if pharmacy closed?

If your local pharmacy shuts down, you can usually transfer your prescriptions to another pharmacy of your choice, as long as they’ve got the meds in stock or can order them.

Most pharmacies hook into regional or national networks, so moving your scripts is usually seamless. If the closure catches you off guard, check with your health plan to confirm coverage at the new spot. In a pinch, your doctor can help with emergency supplies or temporary fixes. The FDA recommends keeping an updated med list and backup pharmacy in mind so you’re never stranded when a location closes.

What is high risk medications?

High-risk medications (HRMs) are drugs that can cause serious harm if misused, whether from dosing errors, bad interactions, or allergic reactions.

Think blood thinners, insulin, opioids, or chemo drugs. These meds often need extra safeguards—like double-checks by two staff members, patient counseling, and tech like bar-code scanning. Institute for Safe Medication Practices (ISMP) keeps a running list of these trouble-makers and pushes for protocols to keep patients safe, including staff training and standardized processes.

What are the three types of formulary systems?

The three main formulary types are open, closed, and tiered—each handles medication coverage in a different way.

An open formulary covers every approved drug without restrictions. A closed formulary only covers a specific list of drugs. A tiered formulary splits drugs into cost-sharing groups, so you pay different copays or coinsurance depending on the tier. Tiered systems are huge in Medicare Part D and employer plans. American Medical Association (AMA) says tiered formularies nudge patients toward cost-effective options while still giving them some wiggle room for personal needs.

What is the meaning of formularies?

A formulary is a master list of prescription drugs that a health plan, hospital, or pharmacy benefit manager agrees to cover, guiding what gets prescribed and dispensed.

Back in the day, the term meant a book of medicinal recipes. Today, it’s all about managing costs, ensuring treatments make sense, and improving patient outcomes. Formularies aren’t set in stone—they evolve as new science and pricing changes hit the market. Merriam-Webster Dictionary traces the word back to the Latin *formularius*, meaning “of or relating to a formula,” which fits the structured way we handle medications today.

What does it mean if a drug is not on formulary?

If your drug isn’t on the formulary, your insurance or hospital won’t cover it—so you’ll pay full price unless you qualify for an exception.

Drugs get left off when equally good (and cheaper) alternatives exist. If your doctor insists you need the non-formulary drug, you can request an exception, but that usually means submitting extra paperwork and getting plan approval. Healthcare.gov advises checking your plan’s drug list before starting a new med to dodge surprise bills.

How drug formulary is beneficial in hospitals?

A hospital drug formulary improves patient care by steering clinicians toward safe, effective, and affordable meds while making inventory smoother and reducing waste.

By locking in a standardized drug list, hospitals cut down on prescribing errors and make sure critical meds are always in stock. Formularies also help implement clinical pathways, so treatment stays consistent across the board. Institute for Healthcare Improvement (IHI) calls well-run formularies a must-have for high-reliability medication systems and safer patient outcomes.

What is the purpose of a drug formulary?

The main goal of a drug formulary is to push doctors and patients toward safe, effective, and budget-friendly meds while keeping healthcare costs in check and drug use appropriate.

Formularies act as a bridge between what works medically and what the system can afford, evolving as new treatments emerge and prices shift. America’s Health Insurance Plans (AHIP) puts formularies at the heart of value-based care, arguing they lead to better health outcomes and smarter spending when managed thoughtfully.

Edited and fact-checked by the TechFactsHub editorial team.
David Okonkwo

David Okonkwo holds a PhD in Computer Science and has been reviewing tech products and research tools for over 8 years. He's the person his entire department calls when their software breaks, and he's surprisingly okay with that.