Starting a GLP-1 in January: What to Set Up in December

If you're planning to start a GLP-1 medication in January, the most useful thing you can do is spend December on paperwork and setup. Insurance plans often reset on January 1, prior authorizations may have to be redone, and clinics get busy with new-year appointments. People who arrive at their first visit with coverage checked, labs done, and a medication list ready tend to start sooner and with fewer surprises.

This guide walks through what to do in the weeks before your start date. It doesn't cover which drug or dose is right for you; that's the prescriber's decision once they've evaluated you.

Check your 2027 coverage, not your 2026 coverage

The coverage that matters is the plan you'll have on the day the prescription is filled. For many people that's a new plan year starting January 1, and several things can change at once:

• Formulary. A formulary is your plan's list of covered drugs. Insurers and pharmacy benefit managers update these lists, and many changes take effect January 1. A drug that was covered in 2026 may move tiers, require step therapy, or drop off entirely, and an uncovered drug may be added.
• Weight-loss exclusions. Some employer plans cover GLP-1s for type 2 diabetes but exclude them for weight management. That exclusion can be added or removed at renewal.
• Deductible and out-of-pocket maximum. On most calendar-year plans, your deductible starts over in January, so your first fills may cost more than late-year fills did.
• New plan entirely. If you changed jobs, picked a new plan at open enrollment, or are moving to Medicare, you're starting from scratch with a new set of rules.

How to check

1. Get the 2027 formulary. Log in to your plan's member portal or call the number on your card and ask for the drug list that takes effect in January. Search for the specific drug names your clinician is considering.
2. Ask the right questions. Is it covered for my diagnosis (diabetes, weight management, heart disease, sleep apnea, etc.)? Is prior authorization required? Is there step therapy? What tier, and what's my expected cost?
3. Write down the answers. Note the date, the representative's name, and a reference number. If the answer turns out to be wrong in January, that record helps.
4. Check employer benefit materials. If you get coverage through work, the open-enrollment summary may spell out GLP-1 rules, including any wellness-program requirements.

Our insurance coverage guide explains the common coverage patterns, and if you're on or moving to Medicare, see the Medicare coverage overview.

Prior authorization: why timing matters in January

Prior authorization (PA) is, in HealthCare.gov's definition, approval from a health plan that may be required before you fill a prescription. In practice, your prescriber submits clinical information and the plan decides whether it will pay. PA approvals are generally tied to a specific plan and time period. That creates a few January-specific problems:

• If your plan changes on January 1, a PA approved under your old plan usually doesn't carry over. Your prescriber may need to submit a new one.
• A PA generally can't be submitted until there's a prescription and, often, documentation from a visit. If your first visit is in mid-January, the PA clock starts then.
• Plans and prescriber offices both see a surge of new-year requests, so turnaround can be slower than usual.

What you can do now: find out whether a PA will be required under your 2027 plan, and what criteria it uses. Common criteria include BMI thresholds, documented weight-related conditions, and sometimes proof of a prior diet or lifestyle program. If your plan requires documentation of a supervised lifestyle program, ask whether visits or programs from 2026 count. Bringing those records to your first appointment can shorten the process. Our prior authorization guide covers what prescribers submit, and if you're denied, the appeals guide explains next steps.

Book the first visit and baseline labs early

December is a hard month to get appointments. Clinics close for holidays, and January books up with new-year starts. If you want a January start, schedule your first visit now, even if it's a few weeks out.

Ask the clinic whether they want labs before the visit. Many prescribers want recent results before starting a GLP-1, and having them already done can mean a prescription at the first visit instead of the second. The specific panel varies by clinician and your history, but commonly requested tests include:

Your prescriber decides what's needed; this list is for preparing questions, not ordering tests yourself. If you had labs done in the past few months, ask whether they'll accept those. See lab tests before starting a GLP-1 for more on each one.

Health history to gather

The FDA labels for semaglutide and tirzepatide carry a boxed warning about thyroid C-cell tumors, based on rodent studies (whether this happens in humans is unknown), and they are contraindicated in people with a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2. Your prescriber will ask about this. December is a good time to ask relatives about any thyroid cancer history, since holiday gatherings make that conversation easier.

Also gather:

• A full medication and supplement list, including doses
• History of pancreatitis, gallbladder disease, kidney disease, or diabetic eye disease
• Any plans for pregnancy, and your current birth control method. The Zepbound label advises switching from oral birth control or adding a barrier method for 4 weeks after starting and after each dose increase.
• Any upcoming surgeries or procedures that will involve anesthesia
• Any history of disordered eating or mental health conditions
• Records from previous weight-management treatment, including prior GLP-1 use and why it stopped

Our one-page medication history guide shows how to organize it.

Record your own baseline measurements

The scale is only one number, and it can be misleading in the first weeks. Take a few measurements in late December so you have something to compare later:

• Weight: same scale, morning, after using the bathroom, on three different days. Write down the average.
• Waist: measured at the level of your belly button, standing relaxed.
• Blood pressure and resting heart rate: seated, after five minutes of rest, on a few mornings. GLP-1 labels report small average heart rate increases, so a baseline helps put later readings in context.
• How clothes fit: pick one pair of pants or a shirt as a reference.
• Strength or function: how many times you can stand from a chair in 30 seconds, or how long a familiar walk takes. These help track muscle and fitness, which matter as much as weight.
• Current eating: jot down what a few typical days of food and drinks look like, including alcohol.

Bring these to your first visit. They're useful context for your prescriber, and they give you a fair way to judge progress beyond the scale.

Set up your kitchen before your first dose

The early weeks often bring reduced appetite and, for many people, nausea or other GI side effects. In the Wegovy trials, nausea was reported by 44% of people on the drug versus 16% on placebo. It's easier to eat well during that phase if the right foods are already in the house.

Protein that's easy to eat in small amounts

• Greek yogurt, cottage cheese, and skyr
• Eggs, or hard-boiled eggs prepared ahead
• Rotisserie chicken, canned tuna or salmon, tofu
• Protein shakes or powder for days when solid food doesn't appeal
• Beans, lentils, and edamame

For queasy days

• Plain crackers, toast, rice, and broth
• Ginger tea or ginger chews
• An electrolyte drink or powder
• A water bottle you'll actually carry

For constipation

• High-fiber foods you already like, such as oats, berries, pears, and vegetables
• Ask your prescriber or pharmacist now which over-the-counter option they'd suggest if you need one, so you're not guessing later. Our constipation guide explains the stepwise approach.

Questions to bring to your first visit

Write these down and bring them. Ten minutes go fast.

• Which medication are you recommending, and why that one for me?
• Will my insurance cover it, and who handles the prior authorization?
• If coverage is denied, what's the plan: appeal, a different drug, or a cash-pay option?
• What's the dose schedule for the first few months, and when will we decide on increases?
• What side effects should I expect, and which ones mean I should call you?
• What should I do if I miss a dose or get sick?
• Do any of my current medications need to change, especially diabetes drugs, blood pressure medications, or birth control?
• How much protein should I aim for, and should I be doing strength training?
• When are my follow-up visits and labs?
• How do I reach you between visits?

For a fuller list, see questions to ask your doctor and what to bring to your first appointment.

Your December checklist

1. First week of December: Get your 2027 formulary and call your plan about coverage and prior authorization for the drugs you're considering.
2. By mid-December: Book your first visit for early January. Ask whether the clinic wants labs beforehand, and schedule them.
3. During the holidays: Ask family about thyroid cancer history. Gather your medication list, past records, and any documentation of previous weight-management programs.
4. Last week of December: Take baseline measurements. Stock protein, queasy-day foods, fiber, and fluids. Switch to smaller plates.
5. Before your visit: Write out your questions and bring your measurements and records.
6. After your first dose: Track side effects and food intake for the first few weeks so your follow-up visit has real data. Our first 90 days timeline shows what to expect.