Yes - this is really important. The U.S. Food & Drug Administration (FDA) is responsible for setting the rules about prescription sales and at this time, you need one to be able to purchase an oxygen concentrator. It’s really important that you get a prescription from your doctor as they’ll be able to prescribe the exact amount of oxygen you need. You may only need to use an oxygen concentrator while exercising or sleeping, or you may need one for every aspect of your life, so make sure you seek expert advice before buying anything as no two COPD sufferers are the same.