It can also help with increasing confidence and enhancing the sexual experience. It affects the way the medicine works. You could also ask your pharmacist for advice on other ways to help you remember to take your medicine. How to take tablets Swallow tablets whole with a drink of water or juice but not grapefruit juice. For these reasons, before you start taking sildenafil it is important that your doctor knows: If you have any disease, injury or deformity of your penis. · Manufacturer’s PIL, Viagra® 25 mg, 50 mg, mg tablets; Upjohn UK Ltd, The electronic Medicines Compendium. Dated November British National . About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high . About sildenafil. Who can and cannot take it. How and where to get it. How and when to take it. Side effects. Pregnancy, breastfeeding and fertility. Taking sildenafil with other .