If approved, the provider will issue a prescription. This information is reviewed by a licensed practitioner who will assess your eligibility for the medication. Erectile dysfunction can be caused by a variety of factors , including age, cardiovascular problems, diabetes, and other conditions that affect nerve function or blood flow. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. Cialis tadalafil : This ED medication works with the same principle as Viagra, but lasts up to 36 hours.A sildenafil (generic Viagra) membership starts at $20 monthly for six tablets of 30 mg. For $ each month, you’ll receive 34 sildenafil tablets of 45 mg each. Generic Viagra . AdSave Time & Money with Online Prescription for Viagra, Cialis, Sildenafil and Tadafil. Free & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Shipping · Real Doctors · Discreet Packaging · Personalized PlanTypes: Sertraline · MEDICATIONS · Testosterone · Genital Herpes. You can take Viagra (sildenafil) if you have high blood pressure that is controlled by blood pressure medications. Caution is warranted in some cases. You should tell your doctor .