Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil is in a class of medications called phosphodiesterase (PDE) inhibitors. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection.


Avoid self medication. Make sure you consult a physician before following any of these information. This is not a medical advice and Lyonsmens won’t be held responsible for any misuse of any information within.


  • The best time to take sildenafil is about 1 hour before sexual activity, but you can take the medication any time from 4 hours to 30 minutes before sexual activity.
  • It should be noted that sildenafil should not be taken more than once every 24 hours.
  • You can take sildenafil with or without food. (However, if you take sildenafil with a high-fat meal, it will take longer for the medication to start to work.)
  • It is important you follow the instructions on your prescription label carefully, and so not hesitate to ask your doctor or pharmacist to explain any part you do not understand.
  • Do not underdose or overdose on sildenafil.


The most common side effects may include:

  • flushing (warmth, redness, or tingly feeling)
  • headache
  • dizziness
  • abnormal vision (blurred vision, changes in color vision)
  • runny or stuffy nose (nasal congestion)
  • nosebleeds
  • sleep problems (insomnia)
  • muscle pain (myalgia)
  • back pain
  • upset stomach
  • rash

Some other side effects may include:

  • ringing in your ears, or sudden hearing loss
  • irregular heartbeat
  • swelling in your hands, ankles, or feet
  • shortness of breath
  • seizure (convulsions) or
  • a light-headed feeling

This is not a complete list of side effects, make sure you contact your physician before use. Proper analysis and in depth medical tests will be required before use.


Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop taking sildenafil immediately and get emergency medical assistance if you notice the following symptoms during use:

  • heart attack symptoms (chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating)
  • vision changes or sudden vision loss; or
  • erection is painful or lasts longer than 4 hours (prolonged erection can damage the penis).


Consistent with its known effects on the nitric oxide pathway VIAGRA was shown to potentiate the hypotensive effects of nitrates, and its administration to patients who are using nitric oxide donors such as organic nitrates or organic nitrites in any form either regularly and/or intermittently is therefore contraindicated.

Hypersensitivity Reactions
Viagra is contraindicated in patients with a known hypersensitivity to sildenafil, or any component of the drug. Hypersensitivity reactions have been reported, including rash and urticaria.

Concomitant Guanylate Cyclase (GC) Stimulators
Viagra is not to be used by patients who are using a GC stimulator, such as riociguat. PDE5 inhibitors, which includes Viagra, may potentiate the hypotensive effects of GC stimulators.


  • Ask your pharmacist or doctor for a list of the ingredients used in the creation if the drug to determine if you are allergic to any of the components of sildenafil.
  • Ensure that you do not take sildenafil with any of the following: riociguat (Adempas) or nitrates (medications for chest pain) such as isosorbide dinitrate (Isordil), isosorbide mononitrate (Monoket), nitroglycerin (Minitran, Nitro-Dur, Nitromist, Nitrostat, others), amyl nitrate and butyl nitrate (‘poppers’) while taking sildenafil.
  • Ensure that you tell your doctor all meds you are on during consultation to enable proper administration of sildenafil.
  • Ensure that you tell all your healthcare providers that you are taking sildenafil. If you ever need emergency medical treatment for a heart problem, the healthcare providers who treat you will need to know when you last took sildenafil.
  • If you notice any side effect or unusual reaction as a result of using sildenafil, make sure you seek medical attention immediately.

Note: These summary do not include all the information needed to use Viagra effectively or safely. Consult your doctor.


Q: How often can I use it?
A: The recommended usage is once a day.

Q: Will it cause cancer?
A: NO. Research reveals that it doesn’t.

Q: What if it doesn’t work?
A: Viagra requires sexual excitation to work. You may be too tired or insufficiently sexually excited. If it does not work repeatedly you should make an appointment to discuss treatment alternatives.

Q: Can VIAGRA be used in women?
A: No. Its safety and effectiveness has not been established in any group other than men.


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