News & Trends

Storm season and refrigerated weight-loss medication: what GLP-1 users should know when the power goes out

By the US Health Digest editorial team · August 16, 2026

The refrigerator question has a documented answer, printed on each product's FDA label — and the windows differ by more than a month. As of Saturday afternoon, more than 150,000 people in Indiana were without power after a week of catastrophic flooding, in the stretch when most Atlantic hurricane activity occurs. The FDA labels for Wegovy, Ozempic, Zepbound, Mounjaro and Saxenda each define an unrefrigerated window — 21 days for a Zepbound or Mounjaro single-dose pen, 28 for a Wegovy pen, up to 56 for an in-use Ozempic pen — all capped at 86°F (30°C). And FDA is blunt about water: drugs that touched flood or contaminated water should be discarded.

The week that made this practical

Between August 11 and 13, storms dropped what the National Weather Service in Indianapolis called "catastrophic flooding for portions of central Indiana," with a top verified total of 11.50 inches of rain in Henry County. New Castle recorded 11.23 inches in roughly 32 hours — assessed at one location as a 1-in-1,000-year amount — and the White River at Anderson crested at a record 24.93 feet early Friday. Governor Mike Braun declared a Statewide Disaster Emergency, deployed the Indiana National Guard, and requested a presidential emergency declaration through FEMA; on Saturday President Trump approved the declaration as utility NIPSCO's outages, initially over 300,000, still stood near 157,000 households.

An outage measured in days is the scenario the storage fine print on a GLP-1 carton exists for — and per National Hurricane Center climatology, the Atlantic season's peak is September 10, with most activity between mid-August and mid-October.

Why a weight-loss injection needs a refrigerator at all

Semaglutide, tirzepatide and liraglutide are peptides — chains of amino acids, structurally closer to insulin than to an ordinary tablet — and peptides in solution degrade with heat and are damaged by freezing, which is why GLP-1 drugs ship and store cold in the first place, and why every label below says "do not freeze." This is the storm-season sibling of the heat problem we covered in July's piece on GLP-1 medication in a record-hot summer.

What each label actually allows outside the refrigerator

Figures are from each product's FDA prescribing information — the most recent label revision we could locate, via Drugs@FDA and DailyMed, as of publication. The default for all is refrigeration at 2°C to 8°C (36°F to 46°F); the table shows the exception each label permits.

Three fine-print points matter in an outage. First, the day counts are conditional as well as different — Wegovy's 28 days apply "prior to the pen or syringe cap removal," Ozempic's 56 "after first use"; if your situation does not match the label's wording, that is a pharmacist question. Second, the tirzepatide labels count time out of the refrigerator as a running total — Zepbound and Mounjaro single-dose pens and vials are discarded "after a total of 21 days at room temperature," so in an outage that comes and goes, the unrefrigerated days add up. (An earlier Zepbound label, revised 02/2026, went further: a room-temperature pen "should not be returned to the refrigerator." The current 04/2026 revision drops that sentence — if your carton still carries it, ask a pharmacist which applies.) Third, every ceiling is 86°F (30°C); the labels give no allowance for temperatures above it, and a closed-up house in August can pass 86°F. On that last case, Novo Nordisk's medical-information page for clinicians says of Ozempic and Saxenda that each "can be used as long as the product has not been exposed to temperatures below 36°F or above 86°F" — and beyond the manufacturers, the closest federal guidance concerns a different peptide.

The precedent: what FDA says about insulin in an emergency

FDA maintains a page titled "Information Regarding Insulin Storage and Switching Between Products in an Emergency," instructive because insulin is the archetypal refrigerated peptide injectable. It notes unopened insulin can remain "unrefrigerated at a temperature between 59°F and 86°F for up to 28 days and continue to work" — the same shape as the GLP-1 windows above. Beyond that it is pragmatic rather than absolute: "Under emergency conditions, you might still need to use insulin that has been stored above 86°F," while keeping it "as cool as possible"; once refrigeration returns, exposed vials "should be discarded and replaced as soon as possible."

To be precise about scope: that page is about insulin. In our searches of FDA's site we could locate no equivalent emergency-storage page for GLP-1 receptor agonists — for these drugs, the operative federal storage guidance is the prescribing information quoted above. The insulin page shows how FDA reasons about a refrigerated peptide in a disaster; it is not a rule to transfer to a different drug on your own. Notably, FDA's hurricane-preparedness update points storm-prep readers to that insulin page.

Flood water is a different problem than warm water

A warm pen and a submerged pen are not the same problem. FDA's page "Safe Drug Use After a Natural Disaster" is direct about the second: drugs "should be discarded if they came into contact with flood or contaminated water." One narrow exception: a life-saving drug that looks unchanged — dry pills inside a wet container — "can be used until a replacement is available," but "if the pills are wet, then they are contaminated and need to be discarded." On refrigeration: if power "has been off for a long time, the drug should be discarded and replaced," excepting a drug "absolutely necessary to sustain life (for example, insulin)" until a new supply arrives. Any product requiring reconstitution — including some compounded injectables — should be mixed "only with purified or bottled water."

CDC's page "What to Do to Protect Yourself During a Power Outage" is more conservative than the labels: "When the power is out for a day or more, throw away any medication that should be refrigerated, unless the drug's label says otherwise." For GLP-1s, the label does say otherwise — that is what the table documents. The same page holds two other outage facts: an unopened refrigerator keeps food safe for about 4 hours, and a generator must never run inside or "less than 20 feet from any window, door, or vent" — carbon monoxide kills quickly in enclosed spaces.

A checklist grounded in the documents above

Before the storm. Find your product's row above, then read your own carton — labels change, and yours governs. Per FDA's hurricane-preparedness guidance, keep medications and your medication list in water-tight containers, with ice on hand for refrigerated drugs. If a refill is due, fill it early if your plan allows; if your prescriber works remotely, see how GLP-1 telehealth works.

During an outage. Keep the refrigerator closed; the 4-hour figure CDC cites for food is a reminder that a shut door buys real time. If the outage runs longer, the labels' windows take over: note the date the pen left refrigeration and keep it under 86°F in the coolest available spot, in its carton, out of sunlight. Do not improvise with the freezer or set a pen directly on ice — the Mounjaro, Zepbound and Ozempic labels all bar use of a frozen product. Generators: outside only, 20-plus feet from windows, doors and vents, per CDC.

After a flood. Anything that touched flood water is contaminated per FDA — discard it, with the narrow life-sustaining exception above. Following FDA's insulin logic, treat heat-exposed product as a bridge and replace it once the cold chain is restored. Before injecting anything you are unsure about, call a pharmacist.

Questions for your prescriber or pharmacist

• "My pen was out of the refrigerator from this date, at roughly this temperature — is it within its labeled window?" Dates and temperatures make the question answerable; "it got warm" does not.
• "My situation doesn't match the label's wording." An unopened pen that warmed up, a brief spell above 86°F, a pen that went in and out of the refrigerator across repeated short outages — edge cases are what pharmacists are for.
• "I lost my supply and missed a weekly dose — how do I restart?" Do not resume or re-escalate on your own timeline.
• "Can I get an early or emergency refill under a disaster declaration?" Ask what your state and plan allow.

The bottom line

A power outage does not automatically end a GLP-1 supply: the labels grant real unrefrigerated windows — three to eight weeks depending on the product — provided the medicine stays under 86°F, unfrozen and dry. Flood contact is the bright line; above-label heat exposure is a pharmacist call informed by FDA's insulin precedent. The useful answers are the documented ones — and this time, most are printed on the carton.