When taken at the correct time and paired with sexual stimulation, the erection lasts long enough for successful intercourse. Generic versions of sildenafil, vardenafil and tadalafil are available. Please note: This information is for general reference only. People with heart conditions should never take ED medications without consulting a doctor. The body takes longer to absorb it after a high-fat meal or alcohol.Request a prescription for ED medication like sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra). Amazon Clinic is virtual care on your schedule, from trusted . Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung . Roman’s consultations and follow-ups are free. Medication prices vary based on what your prescriber recommends, whether it’s a generic version, and how many pills you order .