Vi-AK-Ra (Sildenafil) is used to treat erectile dysfunction by increasing blood flow to the penis, helping achieve and maintain an erection. Unlike its brother drug Cialis, Sildenafil(Viagra) has a much quicker onset and shorter effective life. Typically working within 30-60 minutes and lasting about 4-6 hours, offering a shorter window of effectiveness. Our Online Prescribing Physician services ensure you receive expert guidance and a convenient, discreet process from prescription to delivery.