Always seek the advice of your physician or other qualified health providers with any questions you may have regarding a medical condition. Liver function: If you have poor liver function you may need lower doses of Viagra Sildenafil. These factors may affect how you should use Viagra Sildenafil. These are commonly prescribed for an enlarged prostate or male pattern baldness. As part of the sale, it is recommended that you document this with your GP and have a health-check within 6 months if the regular need for the medication is required.What about medications like Viagra ® (sildenafil)? These medications (which also include tadalafil [Cialis ®] and vardenafil [Levitra ®]) help men who can’t get an erection because of problems with blood flow into the penis. They do not help increase sex drive, so they are not useful for treating low libido. Description This medication is typically used for erectile problems in men. Its effects can be felt within 1 hour. Find a Pharmacy Print this card Instructions Certain heart medication . Erectile dysfunction refers to the inability of a man to get or maintain an erection firm enough for satisfying sexual activity. ED can have a negative impact on the emotional well-being of men and their partners as it can be tied to self-image and relationship difficulties. 50% of men will experience ED. It is the most common sexual problem in.