When flying internationally from the UK in 2026, there is no specific "limit" on the amount of medicine you can bring, provided it is for your personal use and corresponds to the duration of your trip. You are generally allowed to bring up to a three-month supply of your prescribed medications. For hand luggage, liquid medicines in containers over 100ml are permitted through security if you provide a doctor's letter or a copy of your prescription as proof of medical necessity. Standard tablets and capsules are allowed without restriction, though it is best to keep them in their original packaging to avoid delays. If your medication contains a controlled drug, you must check the rules of your destination country beforehand and carry a signed letter from your GP detailing your name, travel dates, the names of the medicines, and the dosages. This letter is crucial for both UK security and foreign customs. For sensitive items like insulin, it is recommended to carry them in hand luggage as the extreme temperatures in the cargo hold can damage the medication. Always inform security officers if you are carrying medical equipment like CPAP machines or syringes.