Firstly, if you have any cardiovascular issues or take blood thinning medication talk to a medical professional before using a cock ring for the first time to make sure it is safe for you to use one. Be sure to have emergency shears on hand to remove the ring if an emergency occurs. Remove it as quickly as possible if there is any discomfort or the penis turns white or blue. A cock ring should never be used for more than 30 mins and you should always take one off before going to sleep. If you can’t get the ring off, get to hospital immediately.