Air travel
It is usually advisable that you carry all your medicines with you in your hand luggage, in case your checked luggage goes missing or your medicines are damaged in the baggage hold. However, during current tightening of security and hand baggage restrictions, the Department for Transport has advised that you can only take all essential prescription medicines for the duration of your flight (up to 100ml of liquid creams or gels and up to 50g of powder or tablets).
Essential medicines may be permitted in larger quantities above this limit, but will be subject to authentication. You must have obtained the prior agreement of the airline with which you are travelling and your departure airport. You must also bring supporting documentation from your doctor or other healthcare professional.
Most asthma inhalers do not specify how much liquid medicine is contained within them (they are often measured in puffs or doses), but as a guide most inhalers contain approximately 10–20ml of liquid.

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