Patients assigned to both kopen van vardenafil treatment groups were comparable with regard to baseline characteristics including race all Caucasian sex-ratio, age, socio-demographic criteria, weight and body-mass-index BMI. The researchers point out that these drugs have not been fully explored in females. All too often, we grow up getting bits and pieces of religion, but never take the time to look at the bigger picture. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Visual disturbances including vision loss temporary or permanent such as visual field defect, retinal vein occlusion, and reduced visual acuity, have also been reported rarely in post-marketing experience. Levitra has lasting effect of up 24 hour in the body as compared to Viagra that lasts up to hours only. Descriptive data of adherence and compliance with study medication showed no discernible differences between active treatment and placebo group.