You can take it up to 4 hours before you want to have sex. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. When you make the appointment, be sure to ask if there’s anything you need to do in advance. Use the oral syringe provided with your medication to measure and take your dose. In addition, ED is extremely common.Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing blood flow to the penis to. 16 tablets. £ / month. £ One-time or subscription. Viagra for men, often referred to as the ‘blue pill’, is an ED pill which can help to improve sexual wellbeing by enhancing erectile performance. It works by increasing blood . · Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .