Recent heart or blood vessel problems. If you have an erection that lasts more than 4 hours, get medical help right away. The products discussed in this site may have different product labeling in different countries. Medicines that block an enzyme called CYP3A4. This site is intended only for U. An inherited eye disease that affects the retina. This medicine also works best when you take it an hour before sex on an empty stomach.AVOID COUNTERFEITS FAQs CHOOSE BRAND-NAME VIAGRA The original little blue pill prescribed by doctors for over 20 years Clinically proven to treat men with erectile . Sildenafil (Viagra brand) only works following sexual stimulation. It works within 30 to 60 minutes, but may be taken up to four hours before sexual activity. . According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s .

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