These side effects are usually mild and go away on their own. Are there any brochures or other printed material that I can take home with me? These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. However, if your Viagra is not covered by insurance, taking the script with you gives you the time to shop for the best price. After discussing your erectile dysfunction and your medical history, ask your doctor for a prescription for Viagra. This medicine works best when you take it on an empty stomach an hour before sex.The safest way to get a prescription for Viagra is from your doctor. You can even do this over a telehealth call (on the phone or computer) in many cases, . Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used .  · Proper Use. Drug information provided by: Merative, Micromedex ®. Use sildenafil exactly as directed by your doctor. Do not use more of it and do not use it .