If you are experiencing any of these or develop a painful erection that lasts more than 4 hours, please get medical attention right away. However, some states require a live video consultation. What do I need to know when buying Viagra online? Yes, ED pills can cause side effects. Shipping: Discreet, fast shipping is a must.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is . If you’re interested in buying Viagra online, five of the best options available are Hims, Roman, Lemonaid, Optum Store, and REX MD. Read on for full details on the process . Amazon Pharmacy: Sildenafil (Generic for Viagra, Oral Tablet).us. Account Returns& Orders. Cart. Transfer your prescription for Sildenafil (Generic for Viagra, Oral .