Best thing to do is bring any required medication with you. If you have other medication (on perscription
etc:The UK regulations are more relaxed than most countries and fairly easy to
follow:Firstly you must find out if your drug is a controlled substance in the uk; you can check this here:
Travelers common controlled substance check-list and limits.If you drug is unlisted you can find the full controlled list here:
Complete controlled drugs listFor perscribed non-controlled drugs: . Put it in you hand (carry on plane) luggage. Keep in orgional containers that are clearly marked as to their contents.. Signed letter/note from doctor confirming that the drugs were perscribed. Or a signed repeat (duplicate) perscription. Travel advice sites say that its best to make sure the doctors contact details are printed on either.For CONTROLLED perscribed
drugs:. Same as above but with a few additions: 1. Drugs should be carried with a letter from the prescribing doctor confirming the carriers name, destination, drug details/amounts. 2. For more than a 1 month's stay/supply, you will need a personal license from the "Home Office" (see below.)This is all so when you arrive at the airport you have to declare the medication to the customs desk. As long as you double check with the UK Home Office drugs pageyou should be fine:
Drugs law and licensingFor otc drugs like loperamide: as long as their otc in the UK and you declare then you will be fine. Though there is no offical published info on the subject. Follow the home office rules on the above page and call your local British Embassy if you have any questions.If you do that then you should be able to pass with your meds into the UK without any hindrance from customs.To answer you orgional question; you can purchase Loperamide otc in both large stores and pharmacies in the UK. However you should be warned that its quite expensive: £3.90 approx for 12 pack of immodium and £2.50 for the generics.Best Regards,mr_colt