Privacy: Confirm that your personal data and payment details are confidential. Common ones include: Flushing of the skin. Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. These medicines are called PDE5 inhibitors. Sildenafil Viagra.In the United States, the National Association of Boards of Pharmacy can tell you . Medical Consultation Required: Yes Medications Prescribed: Viagra, Cialis, sildenafil, . But can you order a brand-name medication like Viagra online from the Optum Store, or .