what is it?

Viagra® is the trade name for a drug called Viagra®. Viagra® is one of a class of drugs known as PDE-5 (Phosphodiesterase type 5) inhibitors. Viagra® and the other PDE-5 inhibitors can help men with erectile dysfunction (male impotence) by increasing blood flow to the penis in order to get and keep an erection hard enough for sex.

what's in it?

If you are prescribed Viagra®, each tablet contains Viagra® citrate equivalent to 50 mg of Viagra®. In addition to the active ingredient, Viagra® citrate, each tablet contains the following inactive ingredients: microcrystalline cellulose, dibasic calcium phosphate dihydrate, croscarmellose, sodium, magnesium stearate, hypromellose, titanium dioxide and triacetin.

what's the difference between sildenafil and Viagra®?

Viagra® is a brand name medication invented and marketed by Pfizer, while sildenafil (or sildenafil citrate) is the active ingredient in Viagra®. Sildenafil as prescribed by a provider is a generic alternative to Viagra®.

i placed an order, how does this work?

Since this treatment is a prescription medication, after you place your requested order you will be prompted to complete a medical assessment and complete an online visit with a provider. The provider will determine if a prescription for Viagra® is appropriate. You can find more info about the independent providers accessible through our platform and care delivery here.

who can take this medication?

Viagra® is used to treat men who have erectile dysfunction (also called sexual impotence).
Viagra® belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These
medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The
penis is one of the areas where this enzyme works.

Erectile dysfunction is a condition where the penis does not harden and expand when a man is
sexually excited, or when he cannot keep an erection. When a man is sexually stimulated, his
body's normal response is to increase blood flow to his penis to produce an erection. By
controlling the enzyme, Viagra® helps to maintain an erection after the penis is stroked. Without
physical action to the penis, such as that occurring during sexual intercourse, Viagra® will not
work to cause an erection.

what’s the recommended dosage?

The dose of this medicine will be different for different patients. Follow your provider's orders or
the directions on the label. The following information includes only the average doses of this
medicine. If your dose is different, do not change it unless your provider tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the
number of doses you take each day, the time allowed between doses, and the length of time
you take the medicine depend on the medical problem for which you are using the medicine.
The typical dose is as follows:

Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Do not take more than one 50 mg pill in a 24 hour period.

Your provider may adjust your dose if needed. Always follow your provider’s dosing instructions and consult with your provider on any questions regarding dosage.

how do I take it?

Take Viagra® about one hour before you plan to have sex. Beginning in about 30 minutes and
for up to 4 hours, Viagra® can help you get an erection if you are sexually excited. You will not get an erection just by taking the pill. If you take Viagra® after a high-fat meal (such as a cheeseburger and french fries), the medicine may take a little longer to start working. Viagra® can help you get an erection when you are sexually excited.

how soon can I expect to see results?

Viagra®, should be taken approximately 60 minutes before sexual activity. Most of the time, a standard dose of Viagra® will begin to produce a noticeable effect between 30 and 60 minutes after it's consumed orally, but individual results may vary and not everyone responds to Viagra®.

Important safety information:

Do not take Viagra® if you:

Take any medicines called nitrates, often prescribed for chest pain, or guanylate cyclase stimulators like Adempas (riociguat) for pulmonary hypertension. Your blood pressure could drop to an unsafe level.
Are allergic to sildenafil, as contained in Viagra® and REVATIO, or any of the ingredients in Viagra®

Discuss your health with your provider to ensure that you are healthy enough for sex. If you experience chest pain, dizziness, or
nausea during sex, seek immediate medical help
Viagra® can cause serious side effects.

Rarely reported side effects include:

  • An erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, get medical help right away.
If it is not treated right away, priapism can permanently damage your penis
  • Sudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called
non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking Viagra® and call your healthcare provider right away if you
have any sudden vision loss
  • Sudden hearing decrease or hearing loss. Some people may also have ringing in their ears (tinnitus) or dizziness. If you have
these symptoms, stop taking Viagra® and contact a doctor right away

Before you take Viagra®, tell your healthcare provider if you:

  • Have or have had heart problems such as a heart attack,
irregular heartbeat, angina, chest pain, narrowing of the aortic valve, or heart failure
  • Have had heart surgery within the last 6 months
  • Have pulmonary hypertension
  • Have had a stroke
  • Have low blood pressure, or high blood pressure that
is not controlled
  • Have a deformed penis shape
  • Have had an erection that lasted for more than 4 hours
  • Have problems with your blood cells such as sickle cell
anemia, multiple myeloma, or leukemia
  • Have retinitis pigmentosa, a rare genetic (runs in families)
eye disease
  • Have ever had severe vision loss, including an eye problem
called NAION
  • Have bleeding problems
  • Have or have had stomach ulcers
  • Have liver problems
  • Have kidney problems or are having kidney dialysis have any other medical conditions

Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins,
and herbal supplements. Viagra® may affect the way other medicines work, and other medicines may affect the way Viagra® works, causing side effects.
Especially tell your healthcare provider if you take any of the following:

  • Medicines called nitrates
  • Medicines called guanylate cyclase stimulators such as Adempas (riociguat)
  • Medicines called alpha-blockers such as Hytrin (terazosin
HCl), Flomax (tamsulosin HCl), Cardura (doxazosin
mesylate), Minipress (prazosin HCl), Uroxatral (alfuzosin HCl),
 Jalyn (dutasteride and tamsulosin HCl), or Rapaflo (silodosin).
Alpha-blockers are sometimes prescribed for prostate
problems or high blood pressure. 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. REVATIO is used to treat a
rare disease called pulmonary arterial hypertension (PAH).
 Viagra® should not be used with REVATIO or with other PAH
treatments containing sildenafil or any other PDE5 inhibitors
(such as Adcirca tadalafil)

Viagra® does not protect against sexually transmitted diseases, including HIV.

The most common side effects of Viagra®: headache; flushing; upset stomach; abnormal vision, such as changes in color vision
(such as having a blue color tinge) and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash.


Viagra® (sildenafil citrate) is prescription medicine used to treat erectile dysfunction (ED).
Viagra® is not for women or children.

Important considerations

If you take any medicines that contain nitrates – either regularly or as needed – you should
never take Viagra®. If you take Viagra® with any nitrate medicine or recreational drug containing, nitrates, your blood pressure could suddenly drop to an unsafe level. You could get dizzy, faint, or even have a heart attack or stroke. Nitrates are found in many prescription medicines that are used to treat angina (chest pain due to heart disease) such as:

  • nitroglycerin (sprays, ointments, skin patches or pastes, and tablets that are swallowed
    or dissolved in the mouth) 

  • isosorbide mononitrate and isosorbide dinitrate (tablets that are swallowed, chewed, or
    dissolved in the mouth) 
Nitrates are also found in recreational drugs such as amyl
    nitrate or nitrite (“poppers”).

If you are not sure if any of your medicines contain nitrates, or if you do not understand what nitrates are, ask your doctor or pharmacist.

Viagra® is only for patients with erectile dysfunction. Viagra® is not for newborns,
children, or women. Do not let anyone else take your Viagra®. Viagra® must be used
only under a doctor’s supervision.





Viagra is a registered trademark of Pfizer.



Was this article helpful?
26 out of 36 found this helpful
Have more questions? Submit a request



Article is closed for comments.