The U.S. Food and Drug Administration has issued an alert to healthcare professionals, reminding them that single-patient insulin pens shouldn't be shared, UPI reported. The FDA said insulin pens and insulin cartridges shouldn't be used to administer medication to multiple patients due to the potential risk of transmitting blood-borne pathogens. Officials explained insulin pens are pen-shaped injector devices that contain a disposable needle and either an insulin reservoir or an insulin cartridge. The devices typically contain enough insulin for a patient to self-administer several doses before the reservoir or cartridge is empty. All insulin pens are approved only for single-patient use.