Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. This change implies an evaluation from Sala Especializada de Medicamentos which will issue a technical opinion about the availability of the change as requested, based on technical documents that should demonstrate the safety of the product to become an OTC. If you are taking sildenafil for PAH, take the missed dose as soon as you remember it. In some patients, the use of VIAGRA with alpha-blockers can lead to a drop in blood pressure or to fainting medicines called HIV protease inhibitors, such as ritonavir Norvir , indinavir sulfate Crixivan , saquinavir Fortovase or Invirase , or atazanavir sulfate Reyataz some types of oral antifungal medicines, such as ketoconazole Nizoral and itraconazole Sporanox some types of antibiotics, such as clarithromycin Biaxin , telithromycin Ketek , or erythromycin other medicines that treat high blood pressure other medicines or treatments for ED VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO. Once this commission approves the switch from prescription only to OTC, then interested party can apply for the change of the sales condition enclosing the approval issued by Sala Especializada de Medicamentos.Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision. 1. Avoid taking Viagra with a large meal or high-fat meal. Viagra blood levels peak an hour after you swallow the tablet on an empty stomach. According to Ramin, if you eat a large or high-fat. Do you need an Rx to buy drugs in Medellin? American or Colombian doctor? How many months supply are available? Husband received an Rx that will cost $/month in US, .