Drugs including Viagra and Cialis lead to an average improvement of 4 to 8 points on the scale used by researchers and clinicians. The team behind the new study suggests that .Recreational ED drug use can even cause “psychogenic erectile dysfunction”. Potential Side Effects While generic Viagra is generally well-tolerated, there are some potential side effects to be aware of. Limited Scientific Evidence: Although there is anecdotal evidence supporting the benefits of these supplements, there is limited scientific research available to validate their efficacy. Can sildenafil citrate cause erectile dysfunction? Increasing Blood Flow One of the primary functions of sildenafil is to increase blood flow to the penis.If you don’t have a prescription, the drug itself – not just how you use it – may be a problem. Getting drugs from a friend or other sources is a recipe for expired, fake or . In fact, in some countries, generic Viagra is available without a prescription, making it even more accessible to those in need. Generic viagra is available in various strengths, . Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online.These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. It’s also worth mentioning that generic Viagra should not be taken by everyone. When taken at the correct time and paired with sexual stimulation, the erection lasts long enough for successful intercourse. It’s a common issue that can have a significant impact on one’s self-esteem and relationships. No, generic Viagra is a prescription medication.