Where does a weekly injectable pen actually sit between a departure gate in Delhi and a hotel room in London? Not in the hold, for a start. Not in a coat pocket on a warm walk between terminals either. The pen has a temperature window, an airport offers a string of ways to break it, and the paperwork that gets a traveller through security is a separate problem from the storage question. Both are worth settling before the drive to the airport.
The pens covered here are semaglutide and tirzepatide pens, with insulin glargine as a contrast. The figures come from printed labels issued by Novo Nordisk, Lilly and Sanofi, and those labels differ between the US and the EU. Every number below therefore names the region it comes from. The leaflet inside your own pack decides, and for a pen bought in India that means the Indian leaflet in the carton.
The pen goes in your hand luggage, in its carton
Lilly’s guidance for the Mounjaro KwikPen is plain. Keep the pen with you when you travel, and do not pack it in checked luggage, because a luggage hold can swing through wide changes in temperature. The same page adds that altitude does not affect KwikPen dose accuracy, so the cabin is no threat to the dose itself. Every pen in the table further down has a limit on how long it may sit outside the fridge, and a hold offers no way to watch that clock.
The original carton matters too. The US Wegovy single-dose pen label tells you to keep the pen in its original carton, and so does the US label for an opened KwikPen. Keep the pharmacy label and the prescription details with that carton, since a security desk is the place to have them together.
There is a second reason to keep the pack intact. Telangana’s drug control administration ran drives through 2026 against counterfeit Mounjaro, Ozempic, Wegovy and Rybelsus, and a CDSCO circular to state drug controllers in March 2026 told them to monitor both online and offline sales. A replacement pen bought in a hurry abroad still needs a prescription, and what actually proves a GLP-1 pack is genuine is easier to learn at home than at a foreign pharmacy counter.
What each label allows outside the fridge
Find the row that matches your pen and your region. If your pack came from an Indian pharmacy, treat the table as a guide to the kind of limit your leaflet will give, and read the leaflet itself.
| Pen and label region | Unopened | Away from the fridge, or in use | Freezing | |—|—|—|—| | Ozempic pen, US label | Fridge, 2 to 8 °C, away from the cooling element | After first use, 56 days at 15 to 30 °C or in the fridge, with the cap on | Do not freeze; do not use if frozen | | Ozempic pen, EU label | Fridge, 2 to 8 °C, away from the cooling element | In use: 6 weeks (4-dose pens) or 8 weeks (8-dose pens), below 30 °C or in the fridge | Do not freeze | | Wegovy single-dose pen, US label | Fridge, 2 to 8 °C | Before cap removal, if needed, 8 to 30 °C for up to 28 days in the original carton, away from light | Do not freeze; do not use if frozen | | Wegovy single-dose pen, EU label | Fridge, 2 to 8 °C, in the carton | Unrefrigerated for up to 28 days at not above 30 °C, then discard | Do not freeze | | Mounjaro single-dose pen or vial, US and EU labels | Fridge, 2 to 8 °C | Not above 30 °C for up to 21 days in total, then discard | Do not freeze; protect from heat and light | | Mounjaro KwikPen, US label | Fridge until expiry | Opened: original carton, discard 30 days after first use or after 4 weekly doses, even if medicine remains | Do not freeze | | Mounjaro KwikPen, EU label | Fridge, 2 to 8 °C | After first use, 30 days in the fridge or below 30 °C, then discard | Do not freeze | | Lantus SoloStar pen (insulin glargine), US label | Fridge, or room temperature up to 30 °C for 28 days | In use: 28 days, room temperature only, do not refrigerate | Do not freeze; discard if frozen |
The same drug can carry different numbers in different regions. Ozempic’s in-use period is 56 days on the US label and 6 weeks on the EU label for the 4-dose pen. A Mounjaro KwikPen left unopened at room temperature is discarded after 30 days on the US label, while the EU label allows distribution below 30 °C for up to 72 hours. Neither region is wrong. Each label describes the product it was written for, which is why the table names a region on every row and why the Indian leaflet in the pack is the document to follow.
Read the last row twice. The insulin pen’s in-use rule is the reverse of the semaglutide pens, which accept the fridge, and insulin storage varies by product, so the Lantus rule cannot be carried over to another insulin. Check your insulin’s own leaflet.
The Wegovy US label adds a heat limit: discard the pen if it has been above 30 °C. A pen left on a sunlit windowsill or in a parked car passes that without anyone noticing. The Mounjaro single-dose figure is a running total of 21 days, so a day out of the fridge at the airport, another at the hotel and a third on the return leg all draw from the same allowance. Write the date it left the fridge on the carton.
Security: the prescription, the liquids and the gel packs
Rules differ by country. The clearest published ones come from the UK government and the US Transportation Security Administration. GOV.UK says essential medicines over 100 ml are allowed in hand luggage with proof they are prescribed to you, which can be a doctor’s letter or a copy of the prescription. Hypodermic syringes are allowed in hand luggage. Staff may open containers to screen liquids, and cooling gel packs are allowed.
Keep the letter or the prescription copy in the same pouch as the pen. Staff may open a container to screen a liquid, and the document answers the question of what is inside before anyone has to ask it.
The TSA allows medically necessary liquids above 3.4 oz in reasonable quantities, provided you declare them, and they get extra screening. Its guidance on ice and gel packs for medicines says they may be presented frozen, partially frozen or melted. That last point matters on a long connection, when a pack that was solid in Delhi may be half water in Frankfurt.
For departures from India, the safe course is to carry your prescription, declare injectable medicines at security and check your airline’s own rules before you travel. Ask the prescriber for a letter if the trip crosses more than one border.
Moving the weekly dose day without guessing
None of these labels says anything about time zones. What they do give is a minimum gap between two doses when the weekly day is moved, and the gap is counted in hours. A long-haul flight changes the clock on the wall, so a dose planned for the first evening abroad can land closer to the last one than the label allows.
The Ozempic US label lets the day change as long as at least 2 days (more than 48 hours) separate the two doses. The Ozempic EU and Wegovy EU labels set the minimum at 3 days (more than 72 hours). Mounjaro’s US and EU labels also say 3 days, and a missed Mounjaro dose can be taken within 4 days (96 hours) before the label tells you to skip it.
Those gaps differ by product and by region, which is why the day should never be shifted by whatever feels convenient on the night. The label allows the weekly day to be moved if the minimum gap is kept. Agree the change with the prescribing doctor before the trip, and write the new dates down.
Hotel fridges, delays and the cooler bag
Picture a composite traveller, invented for the example: a Thursday-night injector flying Delhi to Singapore on a connection that slips by six hours. The pen has left the fridge at home, and its allowance has started counting. Every hour of delay is an hour spent against the limit in the table, and the Mounjaro label measures that limit as a running total of days, so the delay is subtracted from the same pot as the hotel nights. Put the departure and return dates in the phone calendar next to the injection day, and the sums are easy to check.
A hotel room fridge is the obvious fix, and it brings its own trap. The Ozempic label asks you to keep the pen away from the cooling element, and every label in the table says do not freeze. Keep the pen in its carton and well away from whatever part of the fridge does the cooling.
Cooling gel packs are allowed through security, as the UK and US guidance above shows. The labels in the table say nothing about packing a pen against ice, and they do say do not freeze, so a frozen pack pressed against the pen is the thing to avoid. A pen kept out past its allowance is discarded under the label’s own terms. A pharmacist or the prescriber can say what to do next, and no website can.
Back home, the clock keeps running
The trip ends, and the labels do not. A Mounjaro KwikPen on the US label is discarded 30 days after first use or after four weekly doses, even if medicine remains, so the days spent abroad count toward a limit that carries on at home, and storing and disposing of a weekly injectable at home is the part of the routine that outlasts the journey.
Take the carton out of the bag when you unpack, count the days the pen spent outside the fridge against the table above, ask the pharmacist if the total is close to the limit, read the leaflet for the in-use days that apply to your pen, and put the pen back where it lives. The labels used here carry revision dates running from 2025 into 2026, so the leaflet in your next pack may have changed since this trip. On the day you fly, it is the leaflet that counts, and what is written here comes second to it.