It is important that you should keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other health supplements. You need to bring this list together with you every time you see a doctor or if you are admitted to a hospital. Additionally it is important information to carry to you in case there is emergencies. If you are taking sildenafil for erectile dysfunction, you are unlikely to miss a dose since this medication is taken as needed, not on a normal dosing schedule. tell all your healthcare providers that you will be taking sildenafil.