Yes, using your Barclaycard to take out cash, or for other cash-like transactions, might be more expensive than using your Barclaycard in a shop, so make sure you understand what the interest and fees will cost you.
You're charged interest from the date of your transaction, to the date you pay it off. This always applies to sterling withdrawals, even if you pay your total outstanding balance in full by your payment due date. For non-sterling cash withdrawals, you'll benefit from the up to 56-day interest free period if your balance is repaid in full by your payment due date.
You'll also pay a fee when you withdraw cash. The typical fee is 2.99% if your transaction is less than £100 and 2.99% if your transaction is more than £100. For foreign currency withdrawals, there's just one single non-sterling transaction fee of 2.99%. You'll find all the information you need including your total and daily cash withdrawal limits in the terms and conditions on your monthly statement.