Before taking Viagra, tell your doctor or pharmacist if you are allergic to it or if you have any other allergies. This product may contain inactive ingredients, which may cause allergic reactions or other problems. Consult your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: heart problems, the last 6 kidney disease, liver disease, high or low blood pressure, severe loss of body water (dehydration), penile disorders, history of painful / prolonged erection (priapism), conditions that may increase the risk of priapism, eye problems.
This medicine may cause dizziness or vision problems. Do not drive, operate machinery, or do activities that require alertness or clear vision until you are sure that you can safely do these activities. Limit alcoholic beverages.
Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, over-the-counter medications, and herbal products).
This brand of drug is generally not used in women. During pregnancy, Sildenafil should be used only when clearly needed. Discuss risks and benefits with your doctor.
It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.
Drug interactions can change the way your medications work or increase the risk of serious side effects. This document does not contain all possible drug interactions.
A drug that may interact with this medicine is riociguat.
Viagra can cause a serious drop in your blood pressure when used with nitrates. Severe drop in blood pressure can cause dizziness, fainting, and, in rare cases, heart attacks or strokes. Do not use Viagra with any of the following: certain medicines used to treat chest pain / angina (nitrates such as nitroglycerin, isosorbide), recreational drugs called poppers containing amyl nitrate, amyl nitrite, or butyl nitrite.
If you are also taking an alpha blocker medication (such as doxazosin, tamsulosin) to treat a prostate / hypertensive hyperplasia or hypertension, your blood pressure may become too low which may cause dizziness or fainting. Your doctor may start treatment with a lower dose of Viagra to minimize the risk of low blood pressure.
Other medications can affect the elimination of Sildenafil from your body, which can affect the functioning of sildenafil. HIV protease inhibitors (such as ritonavir, saquinavir), hepatitis C virus protease inhibitors (such as boceprevir, telaprevir), mifepristone, rifampin, HIV protease inhibitors Clarithromycin, erythromycin), among others.
Do not take this medicine with any other products containing sildenafil or other similar medicines for erectile dysfunction (ED) or pulmonary hypertension (such as tadalafil, vardenafil).
To treat ED erectile dysfunction, take this medication by mouth as directed by your doctor, usually as needed. Take Viagra for at least 30 minutes, but not more than 4 hours before sexual activity (1 hour before is most effective). Do not take more than once a day.
A meal rich in fat can delay the rapidity with which the medication begins to work.
The dose is based on your medical condition, response to treatment and other medications you are taking. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).