Traveling with peptides
Flying with vials and syringes, keeping them cold, staying on schedule across time zones, and crossing borders.
Airport security (US)
- TSA allows medically necessary liquids over 3.4 ounces in reasonable quantities; declare them at the checkpoint.
- Unused syringes are allowed when they’re with injectable medication; declare them too.
- Ice packs, freezer packs and gel packs that keep medicine cool may go through screening frozen, partly frozen or melted.
- Keep vials, pens and syringes in your carry-on. Checked holds can get very cold or warm.
Keeping it cold
| What you carry | Out of the fridge |
|---|---|
| Wegovy pens | Up to 28 days at 8 to 30 °C (46 to 86 °F), before the cap comes off |
| Zepbound single-dose pens and vials | Up to 21 days in all, at no more than 30 °C (86 °F) |
| Zepbound multi-dose vial or KwikPen, unopened | Up to 30 days, at no more than 30 °C (86 °F) |
| A mixed research vial | No data. Keep it at 2 to 8 °C in an insulated case with a cold pack, and never let it freeze. |
| Sealed research powder | No data for any product. Powder keeps better than a mixed vial; carry it sealed and mix at your destination if you can. |
Throw out anything that has frozen, or that comes out cloudy or discolored. Is something wrong? covers what to check.
Time zones and weekly doses
- SemaglutideApproved drug
- LabelWegovy and Ozempic: move the weekly day as long as the last dose was at least 2 days (48 hours) before.
- TirzepatideApproved drug
- LabelZepbound and Mounjaro: move the weekly day as long as doses stay at least 3 days (72 hours) apart.
Most other compounds have no label rule for moving a dose. If a trip pushes a dose late, missed doses gives each compound’s rule, or says there isn’t one.
Crossing borders
- Carry medicines in their original, labeled containers, with copies of your prescriptions listing generic names.
- Bring a letter on letterhead from your prescriber for injectable medicines and for syringes and needles.
- Check the destination’s rules with its embassy or consulate before you go. Some countries prohibit medicines that are legal at home.
- Unapproved peptides face stricter rules. Australia’s TGA, for example, says vials labeled only with codes, or without the ingredient and strength, won’t be released at the border, and that a “research use only” label doesn’t make importing them lawful.
- Pack a small sharps container, and never put loose needles in a hotel or airport trash bin.
Sources: TSA, Disabilities and medical conditions, and Unused syringes (checked October 2026); Wegovy, Ozempic, Zepbound and Mounjaro prescribing information (2026); CDC Yellow Book 2024, Travel health kits; TGA, responsibilities when importing unapproved peptide products (checked October 2026); FDA, Safely using sharps at home, at work and on travel.