Angina severe chest pain , unstable or Arrhythmia irregular heartbeat, within the last 6 months or Blood vessel problems eg, aortic stenosis, idiopathic subaortic stenosis or Heart attack within the last 6 months or Heart failure or Hypertension high blood pressure or Hypotension low blood pressure or Retinal disorders eye problem or Retinitis pigmentosa an inherited eye disorder or Stroke within the last 6 months —Should not be used in patients with these conditions. Regulated pharmacies are registered with the Ministry of Health, and use the term “Pharmacy” in their name. If you already use medicine for high blood pressure hypertension , sildenafil could make your blood pressure go too low. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. Many people bring only the amount of medication they need with them. This medicine comes with a patient information leaflet.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. If you should need a refill on medication or any type of medicine, you should check with the local pharmacies. Costa Rica has a wide network of regulated pharmacies, all over the . Brand names: Viagra, Revatio. Sildenafil comes in three forms: an oral tablet, an oral suspension (liquid), and an injection that’s only given by a doctor. Sildenafil oral tablet is used to.