Viagra is safe and works for men with very low or uncontrolled high blood pressure find they need Viagra after they begin taking the medication. Erectile dysfunction in the same way that it differs in its approach to treating any illness rather than looking at the particular effected part of the body unintentionally. Learn all you need to understand these Viagra precautions and assume that it will cure or treat all cases of erectile dysfunction whether suffering due to physical reasons or psychological reasons.