Viagra 50 mg contains sildenafil, a prescription medicine in the phosphodiesterase type 5 (PDE5 inhibitor) class. It is used to treat erectile dysfunction (ED) in adult men.
Sildenafil helps increase blood flow to penile tissue during sexual stimulation, supporting the ability to achieve and maintain an erection. It does not directly increase sexual desire and does not produce an erection without sexual stimulation.
For authoritative patient information, consult MedlinePlus – Sildenafil.
Viagra 50 mg is prescribed to help adult men who experience difficulty getting or keeping an erection suitable for sexual activity.
Erectile dysfunction can be associated with cardiovascular disease, diabetes, high blood pressure, certain medications, hormonal conditions, stress, anxiety, and other health factors.
Persistent ED should be discussed with a healthcare professional because it can sometimes be associated with an underlying medical condition.
Sexual stimulation triggers the release of nitric oxide in penile tissue. This contributes to the formation of cyclic guanosine monophosphate (cGMP), which relaxes smooth muscle and promotes blood flow.
Sildenafil inhibits PDE5, an enzyme that breaks down cGMP. By slowing cGMP breakdown, sildenafil helps maintain the blood flow needed for an erection during sexual stimulation.
The medicine does not replace sexual stimulation.
For many adults with erectile dysfunction, 50 mg is a commonly used starting dose when sildenafil is prescribed as needed. A healthcare professional may recommend a lower or higher dose depending on effectiveness, side effects, age, medical conditions, and other medications.
Sildenafil for ED is generally taken approximately 30–60 minutes before sexual activity and should not normally be taken more than once in 24 hours.
Patients should follow their individual prescription rather than changing the dose independently.
Sildenafil commonly begins producing an effect within approximately 30–60 minutes.
A high-fat meal can delay absorption and may make the onset slower.
Individual response varies, and sexual stimulation remains necessary.
Sildenafil's erectile effects can remain useful for several hours. It does not mean that an erection should remain continuously present.
An erection lasting longer than four hours is a medical emergency and requires immediate medical treatment.
Possible side effects of sildenafil include:
Headache
Flushing
Indigestion
Nasal congestion
Dizziness
Nausea
Temporary visual changes
Most side effects are generally mild, but severe or persistent symptoms should be evaluated by a healthcare professional.
Sildenafil must not be combined with nitrate medications.
Nitrates such as nitroglycerin and isosorbide medicines are commonly used to treat certain types of chest pain.
Combining sildenafil with nitrates can cause a potentially dangerous decrease in blood pressure.
Anyone taking nitrate medication should inform their healthcare professional before using sildenafil.
Sildenafil should not be taken with riociguat.
Both medicines can lower blood pressure, and taking them together can result in dangerously low blood pressure.
Sildenafil may increase the blood-pressure-lowering effects of alpha-blocker medicines.
Patients taking medicines such as doxazosin or tamsulosin should tell their healthcare professional before using sildenafil.
Dose adjustments or monitoring may be necessary.
Sildenafil should not be combined with other PDE5 inhibitors or erectile-dysfunction treatments unless specifically directed by a healthcare professional.
This includes:
Tadalafil
Vardenafil
Avanafil
Other sildenafil-containing products
Combining these medicines can increase the risk of low blood pressure and other adverse effects.
Sexual activity can increase the workload on the heart.
People with significant cardiovascular disease or those who have been advised to avoid sexual activity should discuss their health with a healthcare professional before taking sildenafil.
Tell your healthcare professional if you have:
Heart disease
Angina
A previous heart attack
A previous stroke
High or low blood pressure
Irregular heartbeat
Other cardiovascular conditions
If chest pain develops during sexual activity, seek emergency medical attention.
Rare but serious vision problems have been reported with PDE5 inhibitors.
Seek urgent medical attention if sudden vision loss or a significant change in vision occurs.
People with certain inherited retinal disorders may require additional assessment before using sildenafil.
Rare cases of sudden hearing loss have been reported.
Seek prompt medical attention if sudden hearing loss, ringing in the ears, or significant changes in hearing occur.
An erection lasting more than four hours requires emergency medical treatment.
Prolonged erections can cause permanent damage to penile tissue and may result in lasting erectile dysfunction if treatment is delayed.
Alcohol can temporarily lower blood pressure and may increase dizziness when combined with sildenafil.
Large amounts of alcohol may also make it more difficult to achieve or maintain an erection.
Patients should discuss alcohol use with their healthcare professional, particularly if they have cardiovascular disease or take blood-pressure medications.
Tell your doctor or pharmacist about every prescription medicine, over-the-counter product, vitamin, and supplement you use.
Important interactions may involve:
Nitrate medicines
Riociguat
Alpha-blockers
Blood-pressure medicines
Other PDE5 inhibitors
Certain antifungal medications
Certain antibiotics
HIV medicines
CYP3A4 inhibitors
Some medicines can increase sildenafil levels in the bloodstream and may require a lower dose.
Before taking Viagra, tell your healthcare professional if you have:
Heart disease
Blood-pressure problems
Liver disease
Kidney disease
Previous heart attack or stroke
Certain eye or retinal conditions
A history of prolonged erections
Penile anatomical abnormalities
Certain blood disorders
Bleeding problems
Your healthcare professional can determine whether sildenafil is appropriate and whether a different dose is necessary.
Keep Viagra in its original container and store it according to the medication label and pharmacy instructions.
Keep prescription medication out of reach of children and anyone for whom it was not prescribed.
Do not share sildenafil with another person.
Unused medication should be disposed of through an appropriate medication take-back program.
Viagra 50 mg contains sildenafil, a PDE5 inhibitor prescribed to treat erectile dysfunction in adult men.
For many adults, 50 mg is a commonly prescribed as-needed dose for erectile dysfunction. The appropriate dose varies between individuals and should be determined by a healthcare professional.
Sildenafil is generally taken approximately 30–60 minutes before sexual activity when prescribed for as-needed use. It should normally not be taken more than once in 24 hours.
No. Sildenafil supports the body's natural erectile response but requires sexual stimulation to produce an erection.
No. Sildenafil and nitrate medications should not be combined because the combination can cause a dangerous drop in blood pressure.
Sildenafil and tadalafil should not be combined unless specifically instructed by a healthcare professional.
No. Sildenafil does not directly increase libido or sexual desire.
Seek emergency medical attention immediately. A prolonged erection can permanently damage penile tissue.
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