Viagra 25 mg contains sildenafil, a prescription medication belonging to the phosphodiesterase type 5 (PDE5) inhibitor class. It is used to treat erectile dysfunction (ED) in adult men.
Sildenafil works by increasing blood flow to the penis when a person is sexually stimulated. It does not directly increase sexual desire and does not produce an erection without sexual stimulation.
For authoritative patient information, consult MedlinePlus – Sildenafil.
Viagra 25 mg is prescribed to help adult men who have difficulty achieving or maintaining an erection sufficient for sexual activity.
Erectile dysfunction can have many possible causes, including cardiovascular disease, diabetes, certain medications, hormonal factors, stress, anxiety, and other health conditions.
Persistent ED can sometimes be an early sign of an underlying medical problem, so individuals experiencing ongoing symptoms should discuss them with a healthcare professional.
During sexual stimulation, nitric oxide is released in penile tissue. This contributes to the production of cyclic guanosine monophosphate (cGMP), which relaxes smooth muscle and increases blood flow.
Sildenafil inhibits the PDE5 enzyme, helping maintain cGMP activity and supporting penile blood flow.
Sexual stimulation is still necessary for sildenafil to produce an erection.
The appropriate sildenafil dose depends on factors such as age, medical history, other medications, and individual response.
25 mg is the lowest standard Viagra tablet strength. A healthcare professional may prescribe this strength when a lower dose is appropriate because of age, medication interactions, medical conditions, or individual tolerability.
Sildenafil for ED is generally taken as needed approximately 30–60 minutes before sexual activity and should not ordinarily be taken more than once in a 24-hour period.
Patients should follow their prescription instructions rather than adjusting the dose independently.
Sildenafil commonly begins working within approximately 30–60 minutes, although the timing varies between individuals.
A heavy or high-fat meal can delay absorption and may make the medication take longer to work.
Sildenafil does not cause an automatic erection. Sexual stimulation is required.
Sildenafil's effects may remain useful for several hours, although this does not mean that an erection will last continuously.
An erection lasting more than four hours is a medical emergency and requires immediate medical attention.
Possible side effects include:
Headache
Flushing
Indigestion
Stuffy nose
Dizziness
Nausea
Temporary visual changes
Side effects may vary between individuals. Persistent or severe symptoms should be discussed with a healthcare professional.
Sildenafil must not be taken with nitrate medications.
Examples include nitroglycerin and isosorbide medicines used for certain forms of chest pain.
Combining sildenafil with nitrates can cause a potentially dangerous drop in blood pressure.
Individuals using nitrate medication should tell their healthcare professional before taking sildenafil.
Sildenafil should not be combined with riociguat, a medication used for certain forms of pulmonary hypertension.
Both medications can lower blood pressure, and their combination can result in dangerously low blood pressure.
Sildenafil can lower blood pressure, and combining it with alpha-blockers may increase this effect.
Patients taking medicines such as doxazosin or tamsulosin should discuss sildenafil use with their healthcare professional.
A clinician may recommend dose adjustments or additional monitoring.
Sildenafil should not be combined with other PDE5 inhibitors or erectile-dysfunction treatments unless specifically directed by a healthcare professional.
This includes medicines containing:
Tadalafil
Vardenafil
Avanafil
Other sildenafil products
Combining ED medications can increase the risk of low blood pressure and adverse effects.
Sexual activity can increase cardiovascular workload.
People with significant heart disease or those who have been advised to avoid sexual activity should discuss their cardiovascular status with a healthcare professional before using sildenafil.
Tell your healthcare professional about:
Heart disease
Previous heart attack
Stroke
Angina
High or low blood pressure
Irregular heartbeat
Other cardiovascular conditions
If chest pain develops during sexual activity, seek emergency medical attention.
Rare cases of sudden vision loss have been reported with PDE5 inhibitors.
Seek urgent medical attention if sudden or significant vision loss occurs.
People with certain inherited eye disorders may require additional assessment before using sildenafil.
Rare cases of sudden hearing loss have also been reported.
Seek prompt medical attention if sudden hearing changes, hearing loss, ringing in the ears, or dizziness occurs.
A prolonged or painful erection lasting more than four hours requires emergency medical treatment.
Without prompt treatment, priapism can damage penile tissue and potentially cause permanent erectile dysfunction.
Alcohol can temporarily lower blood pressure and may contribute to dizziness.
Large amounts of alcohol may also make it more difficult to achieve or maintain an erection.
Patients should discuss alcohol consumption with their healthcare professional, particularly if they have cardiovascular conditions or take blood-pressure-lowering medicines.
Tell your doctor or pharmacist about all prescription medicines, over-the-counter products, vitamins, and supplements you use.
Important interactions can occur with:
Nitrate medications
Riociguat
Alpha-blockers
Other blood-pressure medicines
Other PDE5 inhibitors
Certain antifungal medicines
Certain antibiotics
HIV medicines
Medicines that affect CYP3A4 enzymes
Some medications can increase sildenafil concentrations and may require a lower dose.
Before taking sildenafil, tell your healthcare professional if you have:
Heart disease
Blood-pressure problems
Liver disease
Kidney disease
Previous stroke or heart attack
Certain eye conditions
A history of prolonged erections
Penile anatomical abnormalities
Certain blood disorders
Bleeding problems
Your healthcare professional can determine whether sildenafil is appropriate for you.
Store sildenafil according to the medication label and pharmacy instructions.
Keep it in a secure location away from children and anyone for whom it was not prescribed.
Do not share prescription medication.
Unused medication should be disposed of through an appropriate medication take-back program.
Viagra 25 mg contains sildenafil, a PDE5 inhibitor prescribed to treat erectile dysfunction in adult men.
Yes. Standard Viagra tablets are available in 25 mg, 50 mg, and 100 mg strengths. The appropriate dose depends on the individual patient and should be determined by a healthcare professional.
Sildenafil is generally taken approximately 30–60 minutes before sexual activity when used as needed. Follow the specific instructions provided by your healthcare professional.
No. Sexual stimulation is necessary for sildenafil to produce its erectile effect.
No. Sildenafil should not be combined with nitrate medications because the combination can cause a dangerous drop in blood pressure.
Sildenafil and tadalafil should not be combined unless specifically directed by a healthcare professional.
Seek emergency medical attention immediately. A prolonged erection can permanently damage penile tissue.
No. Sildenafil improves the physical erectile response to sexual stimulation but does not directly increase libido.
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