Remember: if the 50mg strength has not provided the desired outcome, after at least 8 separate attempts you can move up to mg. Viagra works by inhibiting the PDE5 enzyme, which controls muscle contraction in the penis. If your doctor is concerned your ED is an indicator of a more serious problem, they may send you to a specialist who can run some additional tests. Within 24 hours, a healthcare provider will contact you for further information and to present you with several options. Lifestyle changes that can improve your sex life Before you start comparing ED meds , you may want to consider making small lifestyle changes to improve your erections. That means they can increase the amount of Viagra in your body, which can cause unwanted side effects. Certain lifestyle choices can help or hinder the effectiveness of Viagra.No, you should not take Viagra if you don’t have ED. Viagra is a prescription medication that can have serious side effects. And it’s approved only to treat ED, not to be used. AdFree & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly. Save Time & Money with Online Prescription for Viagra, Cialis, Sildenafil and test1.ru Shipping · Real Doctors · Discreet Packaging · Personalized PlanTypes: Testosterone · Erectile Dysfunction · Sertraline · Immune Support · Genital Herpes. Do not take Viagra while taking Revatio and vice-versa. Seek urgent medical advice if an allergic reaction, sudden vision loss, or painful erections lasting more than four hours .