Diabetes and international travel is a routine combination — millions of trips happen safely every year. The difference between an easy trip and a difficult one is planning. The most common issues are running short on supplies, mistimed insulin around time zone changes, food and water-related illness, and difficulty replacing medications abroad. This guide covers each category with practical steps.
Pre-Trip Planning
- Schedule a pre-travel clinic visit 4 to 8 weeks before departure
- Review vaccinations — routine, hepatitis A, typhoid, yellow fever, and others depending on destination
- Update prescriptions to cover 1.5 to 2 times the expected supply
- Confirm passport validity (most countries require 6 months beyond travel dates)
- Research medication legality at destination — some GLP-1 RAs, opioids, and ADHD medications are restricted
- Purchase travel medical insurance with medical evacuation coverage
- Verify your health insurance’s overseas coverage
- Identify nearby hospitals and pharmacies at destination
- Register with the State Department’s STEP program for safety alerts
- Inform a trusted contact of your itinerary
Packing Checklist
- Insulin in original boxes (and refrigerated within 36 to 86°F using a cool pack)
- Insulin pens, pen needles, and spare pen if applicable
- Insulin syringes if applicable
- Pump infusion sets, reservoirs, and adhesive overlays
- CGM sensors, transmitter, and charging cable
- Glucose meter, lancets, and a generous supply of test strips
- Glucagon emergency kit (Baqsimi nasal, Gvoke, or injection)
- Fast-acting glucose (tablets, gels, or juice boxes)
- Ketone meter and strips for type 1 diabetes
- Spare batteries and chargers
- Medications for nausea, diarrhea, pain, and any chronic conditions
- Clinician letter, prescription list, and medical ID
- Travel insurance card and emergency contact list
Going Through TSA and International Customs
- TSA permits all diabetes medications and supplies in carry-on baggage
- Declare insulin, pumps, CGMs, and syringes at the start of screening
- Request hand inspection for pumps and CGMs to avoid scanners if your manufacturer recommends
- Liquid medications including insulin do not have to fit the 3.4-ounce rule when declared
- International customs requirements vary — keep medications in original labeled containers and carry the clinician letter
- Some countries require declaration of medications on arrival forms — check destination rules in advance
- Avoid checking insulin and supplies — cargo holds can freeze, damaging insulin
Time Zone Insulin Dosing
| Direction | Effect on Day Length | Insulin Pattern |
|---|---|---|
| East (e.g., U.S. to Europe) | Day is shortened | Slightly less basal on transition day; bolus per meal |
| West (e.g., U.S. to Asia) | Day is lengthened | Slightly more basal on transition day; possible extra mid-day basal |
| 3 hours or less | Minimal effect | Continue usual schedule with minor adjustments |
| 6+ hours | Major effect | Pre-plan with clinician; pump users use temporary basal rates |
Check glucose more frequently for 24 to 48 hours after major time zone changes. CGM users should keep alerts active. Pump users can program a transition-day basal pattern based on clinician guidance.
Food, Water, and Glucose Patterns
- Unfamiliar foods change glucose patterns — expect variability for the first few days
- Try carbohydrate counting estimates for new foods before increasing meal boluses
- Traveler’s diarrhea causes dehydration, electrolyte loss, and glucose swings
- Drink bottled or filtered water in regions where tap water is not potable
- Avoid ice in those regions
- Peel fruit, eat cooked foods, and avoid undercooked seafood
- Carry oral rehydration salts and an antidiarrheal medication for emergencies
- Alcohol with diabetes — pace, eat first, and monitor for delayed hypoglycemia
Climate and Storage
- Insulin should be stored between 36 and 86°F (2 to 30°C)
- Heat above 86°F degrades insulin potency rapidly
- Freezing also destroys insulin — discard any insulin that has been frozen
- Use a Frio pack, Medactiv iCool, or similar evaporative cooling case in hot climates
- Avoid leaving insulin or meters in direct sunlight, parked cars, or beach bags
- CGM sensors function best in standard climate; extreme heat or cold may affect readings
- Sweating can reduce CGM adhesion — use overlays in hot climates
Activities and Glycemic Effects
- Hiking, walking, and sightseeing add unplanned exercise — risk of hypoglycemia hours later
- High altitude can affect blood glucose patterns; some meters and CGMs lose accuracy above 10,000 feet
- Beach and pool time — keep glucose tablets and a meter in a waterproof case
- Scuba diving requires specific medical clearance and pre-dive glucose protocols
- Long bus or train days — set CGM alerts and pack snacks
- Time changes for meal-related boluses can take days to settle
Emergency Resources Abroad
- International SOS membership covers medical and security assistance globally
- U.S. embassies and consulates can help locate medical providers and replace lost prescriptions
- Travel insurance medical evacuation coverage can transport you home or to a higher-level facility
- The IAMAT (International Association for Medical Assistance to Travellers) maintains a directory of vetted clinicians
- Diabetes UK, IDF, and local diabetes associations often maintain local resource lists
- Most major cities have private hospitals with English-speaking clinicians
Lost or Damaged Supplies
- Many countries have different insulin brands — U.S. brand names may not exist abroad
- Bring your clinician letter listing insulin generic names and concentrations
- Insulin concentrations differ by country — most use U-100, but some use U-40 (typically older formulations and outside the U.S.)
- Confirm syringe matches concentration to avoid 2.5-fold dosing errors
- Local pharmacists can identify equivalents — bring a sample box or empty pen
- Pump supplies and CGM sensors may be hard to find abroad — pack extras and consider a backup pen plan
- U.S. embassy can help expedite replacement prescriptions in emergencies
Language and Communication
- Learn key diabetes phrases in the local language: “I have diabetes,” “I need sugar,” “Please call an ambulance”
- Print a translated medical card listing diagnosis, medications, and emergency contacts
- Use translation apps with offline language packs
- Wear a medical ID engraved with diabetes type and important medications
- If traveling alone, share itinerary and check-in plans with family or friends at home
Related Reading
See our overview of treatment options, our companion article on melatonin and diabetes (useful for jet lag), and our article on CBD and diabetes.
The Bottom Line
Diabetes and international travel mix well with planning. Confirm prescriptions and pack extras, carry a clinician letter, split supplies between bags, and keep insulin within safe temperature ranges. Adjust insulin for time zone changes with your clinician’s input, check glucose more often during transitions, and watch for food- and water-related illness. Travel insurance with medical evacuation and a clear list of emergency resources reduce risk. With those steps in place, most people with diabetes travel internationally as freely and safely as anyone else — and bring back the same memories rather than the same anxieties.
