Fildena (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Fildena (Revatio) is used to improve the ability to exercise in adults with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness). Children should not usually take Fildena, but in some cases, a doctor may decide that Fildena (Revatio) is the best medication to treat a child's condition. Fildena is in a class of medications called phosphodiesterase (PDE) inhibitors. Fildena treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation.

If you are taking Fildena to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Fildena does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus (HIV).

How Should This Medicine Be Used?

Fildena comes as a tablet and suspension (liquid; Revatio only) to take by mouth.

If you are taking Fildena to treat erectile dysfunction, follow your doctor's directions and the guidelines in this paragraph. Take Fildena as needed before sexual activity.

If you are taking Fildena to treat PAH, follow your doctor's directions and the guidelines in this paragraph. You will probably take Fildena three times a day with or without food. Take Fildena at around the same times every day, and space your doses about 4 to 6 hours apart.

If you are taking Fildena for erectile dysfunction, your doctor will probably start you on an average dose of Fildena and increase or decrease your dose depending on your response to the medication. Tell your doctor if Fildena is not working well or if you are experiencing side effects.

If you are taking Fildena for PAH, you should know that Fildena controls PAH but does not cure it. Continue to take Fildena even if you feel well. Do not stop taking Fildena without talking to your doctor.

Ask your pharmacist or doctor for a copy of the manufacturer's information for the patient.

What Special Precautions Should I Follow?

• Tell your doctor and pharmacist if you are allergic to Fildena, any other medications, or any of the ingredients in Fildena products.
• If you are taking Fildena to treat erectile dysfunction, tell your doctor if you have ever been advised by a healthcare professional to avoid sexual activity for medical reasons
• Tell all your healthcare providers that you are taking Fildena
• Women are not supposed to consume this medicine

Some patients experienced a sudden loss of some or all of their vision after they took Fildena or other medications that are similar to Fildena. The vision loss was permanent in some cases. It is not known if the vision loss was caused by the medication. If you experience a sudden loss of vision while you are taking Fildena, call your doctor immediately. Do not take any more doses of Fildena or similar medications such as tadalafil (Cialis) or vardenafil (Levitra) until you talk to your doctor.