The medicines part of travel prep has a deadline most people miss: some of it needs sorting 4–8 weeks before you fly. Vaccinations need time to take effect, some antimalarials start days before you enter a risk area, and airlines and borders have rules about carrying medication. Here's the checklist, ordered by when to do it.
6–8 weeks before: vaccinations and destination research
Check what your destination requires and recommends — the NHS-backed TravelHealthPro and Fit for Travel sites list this by country. Common travel vaccinations (hepatitis A, typhoid, tetanus boosters) ideally go in at least 2 weeks before departure so immunity has time to build; some courses, like rabies or hepatitis B, span 3–4 weeks. Yellow fever vaccination, where required, must be at least 10 days pre-travel and comes with a certificate some countries check at the border.
4 weeks before: antimalarials, if your destination needs them
Malaria prevention is destination-specific — parts of Africa, Asia, and South and Central America carry risk, and the right tablet depends on the region, your medical history and trip length. Timing matters because the options start at different points:
- Atovaquone/proguanil (Maloff/Malarone) — start 1–2 days before entering the risk area, continue 7 days after leaving
- Doxycycline — start 1–2 days before, continue 4 weeks after leaving
- Mefloquine (Lariam) — start 2–3 weeks before (partly to check you tolerate it), continue 4 weeks after
No tablet is 100% protective, so bite avoidance — repellent with 50% DEET, covering up at dusk, treated nets where relevant — remains essential alongside. A short online consultation can confirm which option fits your itinerary and history.
2 weeks before: your regular medicines
- Order enough supply for the whole trip plus at least a week's buffer for delays. If you use NHS repeat prescriptions, order early — don't leave it to the last 48 hours.
- Keep medicines in original packaging with the dispensing label showing your name.
- Check your destination's rules. Some countries restrict medicines that are routine in the UK — codeine-containing painkillers, some ADHD medicines, and strong sleep aids are common examples. Government travel-advice pages list restrictions; some destinations require a doctor's letter or advance permit.
- Ask for a repeat prescription printout or clinician's letter if you carry injectables, controlled drugs, or large quantities.
Refrigerated and injectable medicines (including weight-loss pens)
If you travel with an injectable such as a GLP-1 weight-loss pen or insulin:
- Carry it in hand luggage, never the hold — hold temperatures can drop below freezing, which ruins these medicines
- Use a travel cooling case for journeys longer than the pen's room-temperature allowance; check your specific medicine's in-use storage rules in its leaflet
- Take needles, sharps disposal and your prescription evidence through security together — a dispensing label or prescriber letter smooths the conversation
- Time-zone shifts: for once-weekly injections, a few hours' difference is immaterial; keep to your usual injection day and adjust gradually if needed
1 week before: build the in-flight and first-aid kit
- Painkillers (paracetamol/ibuprofen), antihistamines, plasters and antiseptic
- Oral rehydration sachets and a traveller's diarrhoea plan — loperamide for symptom control; for higher-risk destinations, ask about standby treatment
- Motion sickness tablets if you're prone — most work best taken before travel, not after symptoms start
- Melatonin for jet lag, if appropriate for you — in the UK it's a prescription medicine, so arrange it in advance rather than hunting for it abroad; see our guide on when to take melatonin for your direction of travel
- Sunscreen, insect repellent, and any destination-specific extras (altitude advice for high-altitude trips is worth a separate conversation)
Flight day: the medical bits
- All medicines in hand luggage. Liquids over 100 ml that are medically necessary are allowed but declare them at security with evidence.
- DVT precautions on flights over ~4 hours: move regularly, do calf exercises in your seat, stay hydrated, and consider flight compression socks — particularly if you're pregnant, recently post-surgery, have a clot history or other risk factors (worth a clinician conversation before booking if so).
- Set a reminder for daily medicines across time zones — "when you land" is when routines break.
The bottom line
Work backwards from your departure date: vaccinations at 6–8 weeks, antimalarials at 4, prescriptions at 2, kit at 1, everything in hand luggage on the day. A single travel consultation can cover the destination-specific pieces — antimalarials, standby treatments and jet lag — in one go.
Frequently asked questions
How early should I sort travel vaccinations?
Ideally 6–8 weeks before departure. Most vaccines need at least 2 weeks to build protection, and some courses take a month or more to complete.
Can I take my medication in hand luggage?
Yes — and you should. Keep medicines in original labelled packaging, carry evidence for injectables or controlled drugs, and declare medically necessary liquids over 100 ml at security.
Do I really need malaria tablets?
It depends entirely on the destination, the region within it, and the season. Check TravelHealthPro for your itinerary or complete a travel consultation — and remember bite prevention matters as much as the tablets.
Can I fly with a weight-loss injection pen?
Yes. Carry it in hand luggage with its prescription label, use a cooling case for long journeys, and check your pen's specific in-use storage guidance in the patient leaflet.
References
- TravelHealthPro (National Travel Health Network and Centre). Country information. travelhealthpro.org.uk.
- NHS Fit for Travel. Destination guides. fitfortravel.nhs.uk.
- UK Health Security Agency. Guidelines for malaria prevention in travellers from the UK.
- NHS. Deep vein thrombosis (DVT) — prevention when travelling. nhs.uk.
- GOV.UK. Travelling with medicine. gov.uk/travelling-controlled-drugs.