Do not keep outdated medicine or medicine no longer needed. There is a problem with information submitted for this request. This medicine also works best when you take it an hour before sex on an empty stomach. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. However the dose is usually not more than 40 mg 3 times a day. Push the plunger of the syringe, then insert the tip into the bottle while holding the bottle upright on a flat surface.VIAGRA usually starts to work within minutes. You may take it up to 4 hours before sexual activity. So there’s no need to rush. Eat smart before you start. VIAGRA can be . Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or . Viagra or generic sildenafil for ED should not be used in women. For seniors: The kidneys, liver, or heart of older adults may not work as well as they used to. .