When a man has erectile dysfunction (ED) he literally cannot have sex without any mediating factor.  This is because a penile erection is very much needed for vaginal penetration.  Without it, try as you might but you will be getting nowhere with a flaccid penis.  Fortunately for those who suffer from penile impotence, there are now ED medications that can help them produce the erection they need despite their erectile issues.  Sildenafil 100mg is possibly the most recommended and prescribed ED drug. Sildenafil 100mg is the generic version of V-a.  This means that sildenafil 100mg carries the same overall effect that V-a has.  What makes sildenafil 100mg highly sought after and also being the most prescribed is that it is more affordable than V-a, the branded drug that it replicates.  It cannot be denied that V-a is the drug that started the ED drug industry and is also critically acclaimed for being very effective in treating male impotence.  Since sildenafil 100mg is basically a replica of V-a, it carries the same overall effect and characteristics that its branded equal has. ED medications like sildenafil 100mg are prescription medications.  If you have been prescribed with this drug, make sure that you do not share it with others even if they carry the same symptom of erectile dysfunction as you do.  It is best that they consult their condition with a medical professional and get their own ED medication prescription. Sildenafil is available in doses of 25mg, 50mg, and sildenafil 100mg.  If your doctor has prescribed you particularly with sildenafil 100mg, even if you feel that your current ED medication is too strong or too weak, make sure that you do not make any self-adjustments on the dosage of your ED medication.  Give your doctor a call and inform him of your concerns and allow your doctor to make the necessary adjustments for you. Sildenafil 100mg is an ED drug classified as PDE5 inhibitors.  What makes these ED drugs very effective in treating erectile dysfunction is that it enables effective blood flow towards the cavities within the penis so that an erection can be achieved.  This is possible through effective selective chemical process that instructs the smooth muscles lining the penis to relax to allow blood flow towards the corpus cavernosum.  The great thing about PDE5 inhibitor drugs like sildenafil 100mg is that the erection they produce are very normal like.  Taking sildenafil 100mg does not give you an erection, but the capacity to produce one.  After taking sildenafil 100mg you will need to be sexually stimulated to produce an erection.  Once you are no longer aroused, the erection will go back to being flaccid – very much similar to when you still had normal erectile functions. Most physical pharmacies may not have sildenafil 100mg but they may likely have its branded equal, V-a.  If you want to buy sildenafil 100mg, your best bet will be to buy it online.  The truth is, buying sildenafil 100mg online is very practical as the prices offered by online merchants are significantly lower than that of physical pharmacies.  In fact, if you buy sildenafil 100mg in bulk, you may even get additional discounts per pill that you order.