You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. Severe liver disease. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. Storage Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. You can take this medicine with or without food 30 minutes before sex, depending on the dose. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. These include a heart attack, stroke or a serious heart rhythm disorder in the past six months.Request Appointment. Print. Products and services. Erectile dysfunction: Viagra and other oral medications. By Mayo Clinic Staff. Medicines that you take by mouth are called oral . For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual . You should also avoid products you can buy online without a prescription that claim either to be generic forms of sildenafil or to contain sildenafil. (Sildenafil is the active drug in .