Can I buy any other ED medications over the counter? Both Viagra and Viagra Connect contain the same active ingredient: Sildenafil. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. What Are the Symptoms of Erectile Dysfunction? If approved, the provider will issue a prescription.Out of embarrassment, many men were buying medicines online that were sold as Viagra, but actually contained counterfeit medicines. Men were also turning to . 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. . The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called Missing: stores.