A regular review of sites and internet forums devoted to free samples and pharmaceutical promotions can also yield useful details on the most recent sample offers. Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine. It works best when taken one hour before sex. If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Some medications should not be taken with sildenafil.The effects of Viagra vary for each individual. The effects of taking mg of Viagra can last for up to 4 hours after taking the drug. However, the strength of these effects is weaker at 4 hours. A Florida man has been charged with several felonies and a misdemeanor after police say he threatened a CVS pharmacy, asking for “all bottles” of Viagra, Adderall and other drugs. on October 30, Aerobic exercise is nearly as effective at addressing erectile dysfunction (ED) as medications such as Viagra, and is safe and less expensive, according to a new meta-analysis.