Use the oral syringe provided with your medication to measure and take your dose. If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. How should this medicine be used? Health is a priceless resource, don’t take your chances with self-medication, always look for guidance from a trustworthy professional. Can these traditional, herbal, complementary, or alternative products be advertised directly to the public? If you have an erection that lasts more than 4 hours, get medical help right away.Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 hour.  · The most common OTC medications bought in Colombia are painkillers and cold-related pills, but also dermatologic products and even antibiotics. Since there is no strong policy against this practice it puts the patients at risk. This is when looking for professional advisory is essential. Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the .