The interest rate on cash withdrawals and credit outstanding is mostly same for most credit card companies. For instance if an individual withdraws Rs 20,000 on 5th of a month and the bank generates the credit card statement on the 1st of every month, then an interest would be charge for 25 days. This would be over and above the charge that is levied for withdrawing the cash.
Therefore, withdrawal of cash through a credit card turns out to be very expensive and it is advised to avoid making such a transaction unless you are in a real emergency that demands instant cash and in case you have made a withdrawal, try to repay it as soon as possible in order to avoid the interest that will start mounting up from day 1 of the withdrawal.
Also if you need money for a longer term, it is better to go in for a personal loan that can be easily availed from any lender at rates that are much cheaper than interest rates charged on cash withdrawal through a credit card.