Drug Formulary Basics: A Guide for Hospital Pharmacies
Ever thought about why one hospital uses one particular drug while another located right next door opts for a different one? Chances are that you can attribute such differences to the drug formulary. This may be a fancy term, yet its logic is pretty straightforward. For hospital pharmacy teams, formulary choices can shape patient care, budgets, and even 340B savings.
Here, we cover the drug formulary definition, how drug formularies work, and why they matter for hospitals. We lean on federal sources throughout. We also show how formulary decisions connect to orphan drug purchasing for rural hospitals.
Drug Formulary Definition
A drug formulary is a compilation of prescribed medicines that have been authorized for coverage by the health plan or hospital. According to Medicare, it is a compilation of the covered drugs in a plan, and each plan has its own.
It can also be referred to as a formulary drug list or just a drug list. The names are varied but serve the same purpose. Formularies guide the drugs covered or stocked and their cost implications.
What difference does it make?
Formularies help to ensure uniformity in care, promote safety and efficiency, and provide a standard operating procedure for all concerned.
There are two main types of formularies:
Insurance formularies: These are used by health plans, including Medicare drug plans.
Hospital drug formulary: It is used by hospitals to decide which drugs the pharmacy stocks and clinicians can order.
How Drug Formularies Work
Then comes the question: how do drug formularies work in real life? They combine clinical review, cost, and safety. Two elements consistently appear in the working of a drug formulary:
Tiers
Coverage criteria.
Prescription Drug Formulary Tiers
Many plans sort each prescription drug formulary into tiers. Medicare gives this example:
Tier 1 holds most generic drugs at the lowest copayment.
Tier 2 holds preferred brand-name drugs at a medium copayment.
Tier 3 holds non-preferred brand-name drugs at a higher copayment.
Each plan divides its tiers differently. So the same drug can cost more on one plan than on another.
Coverage Rules and Mid-Year Changes
Medicare says that all drug plans must provide coverage for a wide array of prescription medications. This covers most drugs in categories that are covered by Medicare, including drugs for the treatment of cancer, HIV/AIDS, and depression.
Drug plans can also update their drug list in the middle of the year. This is because there may be changes in therapy, new drugs coming into the market, or new medical data being discovered. Some drugs may have additional requirements, too.
Medicare also points out that a plan's drug list might not include a specific drug. That is why checking the list before a prescription is filled saves headaches for patients and pharmacies alike.
Three Formulary Myths, Busted
Here are three myths associated with drug formulary and facts to bust each myth:
Myth: A formulary is just an insurance thing. Fact: Hospitals that take part in Medicare must run one too.
Myth: Once a drug is listed, the price is settled. Fact: Listing is a clinical decision. The price depends on purchasing programs and manufacturer policies.
Myth: The list only needs a yearly look. Fact: New drugs, safety updates, and price changes arrive all year. Many teams review on a steady cycle instead of waiting.
Hospital Drug Formulary: The Rules Behind the List
A hospital drug formulary works slightly differently from the insurance formulary process. It is not concerned with copays. Instead, it concerns itself with the drugs available in the hospital pharmacy and available for physician prescribing.
Federal rules require one. Under Medicare's hospital Conditions of Participation, 42 CFR 482.25(b)(9), the medical staff must establish a formulary system. The goal is to make sure the hospital has quality drugs at a reasonable cost.
In most hospitals, the Pharmacy and Therapeutics (P&T) Committee makes decisions on an ongoing basis. This committee of physicians and pharmacists evaluates the pros and cons of the new drug and determines whether it should be added to the formulary.
Common questions a formulary review asks include:
Is the drug safe and effective for our patient population?
Are there proven, lower-cost alternatives?
Does it fit our services and case mix?
What will it cost, and how does purchasing price affect that?
Why Formulary Decisions Matter for Rural Hospitals
For Critical Access Hospitals (CAHs), Rural Referral Centers (RRCs), and Sole Community Hospitals (SCHs), formulary choices carry extra weight. Small pharmacy teams need lists that are clinically sound and financially smart.
Medicare also notes that drugs received in a hospital are generally covered under Part A as part of inpatient treatment during a covered stay. In other words, the hospital absorbs much of that cost. Purchasing price matters.
That is where the 340B Drug Pricing Program comes in. HRSA runs it, and it lets eligible hospitals buy covered outpatient drugs at or below a ceiling price. Your hospital drug formulary and your 340B purchasing should work together.
Orphan drugs add a twist. HRSA explains that for CAHs, RRCs, SCHs, and free-standing cancer hospitals, the term "covered outpatient drug" does not include drugs designated for a rare disease under section 526 of the Federal Food, Drug, and Cosmetic Act. Manufacturers are not required to give these hospitals 340B pricing on orphan drugs. A manufacturer may offer discounts at its sole discretion.
So a drug can sit on your hospital drug formulary while its price depends on a manufacturer's policy. If nobody tracks that policy, savings can slip away.
A helpful way to think about it: the formulary is a clinical decision, and 340B purchasing is a pricing decision. Both need to line up with your billing setup. When they do not, money leaks out quietly.
Five Formulary Best Practices for Hospital Pharmacy Teams
You do not need a large team to keep your hospital drug formulary in good shape. These five habits go a long way:
Schedule reviews: Set up a periodic cycle, say quarterly, so that the formulary does not become outdated.
Document all decisions. Maintain proper P&T files indicating reasons behind inclusion, restriction, or removal of specific medications.
Consider all available options. Evaluate generics, biosimilars, and therapies prior to approval of expensive drugs.
Investigate the purchasing process of expensive drugs. Find out whether 340B pricing was applied and how split billing works for each drug.
Evaluate pricing of orphan drugs by manufacturer. Policies are discretionary and constantly changing.
How 340B Orphan Drug Solutions Can Help
Your hospital drug formulary tells you what you can use. Our job is to help you get the best price on eligible orphan drugs.
340B Orphan Drug Solutions is designed with CAHs, RRCs, and SCHs in mind. The company’s founder, Dr. Lisa Nezneski, PharmD, BCPS, has dedicated 11+ years to 340B orphan drugs, having saved over $500 million for hospitals across the nation.
Dr. Lisa Nezneski has adopted a turnkey solution that includes:
Custom orphan drug list based on your facility type and patient mix
Split-billing system compatibility with an upload-ready file
Quarterly manufacturer price change updates on autopilot
Expert assistance plus fractional consulting and training for your team
Want to go deeper? Explore our pages on orphan drug consulting, the orphan drug exclusion, and rural hospital pharmacy.
Let's Look at Your Numbers Together
A strong hospital drug formulary is only half the picture. The other half is making sure every eligible orphan drug is priced right. Schedule a call with Dr. Nezneski to review your current program, spot gaps, and build a plan that fits your hospital.
Schedule your call today or write to 340B Orphan Drug Solutions at [email protected].
