This medicine is available only with your doctor’s prescription. Do not mix the liquid with other medications or add anything to flavor the medication. Sildenafil belongs to a group of medicines called phosphodiesterase 5 PDE5 inhibitors. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Patients should always ask their doctors for medical advice about adverse events. 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.Who may not be able to take sildenafil. Sildenafil is not suitable for some people. To make sure it’s safe for you, speak to your doctor or pharmacist before taking sildenafil if you: have ever had an allergic reaction to sildenafil or any other medicine. have recently had a stroke, heart attack or a heart problem – your doctor should. Superdrug Sildenafil 50mg Film-coated Tablet 4’s. Features. Helps you get and keep an erection. Warning or Restrictions. Viagra is the most popular medication for erectile dysfunction, and is safe and effective for most men. However, it can cause side effects for less than 2% of men who use it. These side effects usually aren’t serious and most go away after a few hours. If you’re worried about getting side effects from Viagra, we have a few tips for keeping.