Guide · Updated November 2026

GLP-1 Step Therapy: What It Is and How to Get It Waived in 2026

Your plan covers Wegovy or Zepbound, but the pharmacy claim still gets rejected. The reason is often step therapy: a rule requiring you to try and fail a cheaper drug first. Here's what step therapy actually requires, which medications plans typically ask for, and the exception process that can skip the line when trying the "step" drug isn't appropriate for you.

Step therapy is one of the more frustrating phrases in GLP-1 coverage, mostly because it sounds like busywork rather than what it is: a formal utilization-management rule with a real process for getting around it when your prescriber can document why it doesn’t fit your case.

Here’s how it works.

Step Therapy at a Glance

Your Prescription	Typical Required “Step”	If That Drug Isn’t Right for You
Wegovy or Zepbound (weight management)	Phentermine, orlistat, Contrave, or Qsymia, depending on the plan	Request a step therapy exception citing a contraindication or documented prior reaction
Ozempic or Mounjaro (type 2 diabetes)	Metformin, in most cases	Request an exception if metformin is contraindicated or was already tried and failed

Exact requirements are plan-specific. Confirm your plan’s written step therapy policy before assuming any drug list applies to you.

What Step Therapy Actually Means

Step therapy (sometimes called “fail first”) requires you to try a lower-cost medication before your plan will cover a higher-cost one for the same condition. For weight-management GLP-1s specifically, that usually means demonstrating that an older, cheaper weight-loss drug didn’t work, wasn’t tolerated, or was already ruled out on medical grounds, before the plan approves Wegovy or Zepbound.

This is different from prior authorization. Prior authorization asks your prescriber to document that you meet clinical criteria (BMI thresholds, comorbidities) for the drug you’re requesting. Step therapy asks you to have already tried something else. Plans frequently require both for the same prescription: prior authorization to establish medical necessity, and step therapy to establish that a cheaper option was tried first.

Which Drugs Plans Typically Require as the “Step”

For weight-management GLP-1 requests, the medications commonly named as the required first step include:

Phentermine, an older appetite-suppressant, generic and inexpensive
Orlistat, a fat-absorption blocker sold generically and as Alli
Contrave (naltrexone-bupropion), a combination anti-obesity medication
Qsymia (phentermine-topiramate), another combination anti-obesity medication

For GLP-1s prescribed under a type 2 diabetes diagnosis rather than a weight-management one, metformin is a commonly required first step, since it’s a long-standing, low-cost first-line diabetes drug.

Which of these your specific plan requires, and how long a trial has to run before it counts as a documented failure, is set at the plan level. There’s no single industry standard duration. Some plans accept a shorter documented trial with a clear intolerance reaction. Others expect a longer supervised attempt. Ask your plan’s pharmacy benefits line directly what counts, rather than assuming a trial length that may not match your specific formulary’s written policy.

Denied after step therapy? See the appeal process that follows.

Get the Appeal Letter Template →

How to Document a “Step” Drug You Already Tried

If you’ve already tried phentermine, orlistat, Contrave, or Qsymia in the past, even years ago, that history can satisfy step therapy if it’s documented. What plans generally want to see:

The medication name, dose, and approximate dates you were on it, pulled from your medical record or pharmacy fill history
Why it didn’t work or wasn’t continued: inadequate weight loss after an adequate trial, a documented side effect, or a medical reason it was stopped
Your prescriber’s note connecting that history to the current GLP-1 request

If your chart doesn’t already reflect this, ask your prescriber to document it before the request goes in. A prior authorization or step therapy submission moves faster when the history is already in your record rather than being reconstructed after a denial.

When You Should Ask for a Step Therapy Exception Instead

Trying the required step drug isn’t always appropriate. Medicare Part D plans must handle exception requests, many commercial plans have an exception process, and many states have step therapy laws for state-regulated plans. Common medical grounds for an exception include:

A contraindication. The phentermine label, for example, lists a history of cardiovascular disease, uncontrolled high blood pressure, hyperthyroidism, glaucoma, a history of drug abuse, pregnancy, and use of an MAO inhibitor within 14 days as contraindications. If a contraindication applies to you, that’s grounds for an exception, not a reason to skip the paperwork.
A documented prior adverse reaction to the required step drug or a drug in the same class.
Expected treatment failure based on your specific history. Some plans accept a prescriber’s clinical judgment that the step drug is unlikely to work for a documented reason, though this ground is harder to win than a contraindication or a specific prior reaction.

Your prescriber submits the exception request, typically through the same portal or fax process used for prior authorization, with documentation supporting one of these grounds. Plans generally have to respond within a set timeframe. For Medicare Part D, CMS rules give plans 72 hours for a standard decision and 24 hours for an expedited one, with the clock for exception requests starting when the plan receives the prescriber’s supporting statement. For other plans, ask directly what the standard and expedited turnaround times are, since these vary by state and by plan type.

Step Therapy and Medicare

If you’re a Medicare Part D beneficiary, the picture is different depending on which coverage path applies. Standard Part D formularies can apply step therapy and prior authorization to covered drugs the same way commercial plans do, but Part D excludes drugs used for weight loss, as the CMS Bridge FAQ notes. The separate Medicare GLP-1 Bridge, which covers Wegovy, Zepbound KwikPen, or Foundayo for weight management with a $50 copay through December 31, 2027, uses its own prior authorization. CMS’s prescriber checklist for the Bridge lists age, BMI and comorbidity criteria. It does not list a required trial of another drug. People with type 2 diabetes, moderate to severe sleep apnea or MASH are not eligible for the Bridge and go through their Part D plan instead. Our Medicare GLP-1 coverage guide covers how the Bridge works.

If the Step Therapy Requirement Stands

Sometimes the exception doesn’t apply and the plan expects an actual trial. If that’s your situation:

Ask what specifically counts. Get your plan’s written step therapy policy for this drug class, including which medications qualify as the step, the minimum trial length, and what documentation counts as a failure. Don’t guess.

Have your prescriber document the trial in real time. Weight, side effects, and the reason for stopping, recorded as you go, makes the eventual step therapy submission stronger than reconstructing it later from memory.

Compare the timeline against your other options. A multi-month step therapy trial has a real cost: time without the medication you and your prescriber believe is the right fit, plus the step drug’s own cost while you’re on it. If cost is the immediate obstacle rather than time, our cheapest GLP-1 online guide and copay card guide cover cash-pay and savings-card routes that don’t depend on step therapy at all.

Bottom Line

Step therapy means your plan wants documented proof that a cheaper drug, usually phentermine, orlistat, Contrave, Qsymia, or metformin depending on your diagnosis, didn’t work before it covers a GLP-1. It’s a real requirement with a real process. If you’ve already tried the required drug, document it. If trying it isn’t medically appropriate for you, ask your prescriber about an exception request rather than assuming you have to complete the step. Get your plan’s specific written policy before you assume any trial length or drug list, since these vary by plan.

FAQ

What is step therapy for GLP-1 medications?

Step therapy requires trying and documenting failure of a lower-cost medication, commonly phentermine, orlistat, Contrave, Qsymia, or metformin, before your plan covers a GLP-1 like Wegovy or Zepbound. It’s separate from prior authorization, though plans often require both.

Can I skip step therapy if I’ve already tried the required drug?

Yes, if it’s documented. Your prescriber submits the medication name, dose, approximate dates, and the medical reason it was stopped or didn’t work, along with the current GLP-1 request.

How do I request a step therapy exception?

Your prescriber submits an exception request, usually through the same portal used for prior authorization, documenting a contraindication, a prior adverse reaction, or another medical reason the required step drug isn’t appropriate for you.

Does step therapy apply to Ozempic and Mounjaro too?

It can, though the required step is usually different. For a type 2 diabetes diagnosis, metformin is a commonly required first step.

Does the Medicare GLP-1 Bridge require step therapy?

CMS’s prescriber checklist for the Bridge lists age, BMI and comorbidity criteria and a prior authorization, but not a required trial of another drug. Your standard Part D plan rules are separate.

Guides:

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What we checked

This AI-assisted public-source desk check reviewed the FDA phentermine label, the CMS rules for Medicare Part D coverage determinations and exceptions, and the CMS Medicare GLP-1 Bridge program page, FAQ and prescriber checklist on November 4, 2026. Plan-specific step therapy lists in this guide are general patterns, not checked against any one insurer. This is not a clinical review and it is not medical advice. Prices and policies change, so confirm them with the provider or your prescriber before you act.