Viagra (Sildenafil): Uses, Dosage, Side Effects, and FAQs

Viagra, the brand name for Sildenafil, is a widely prescribed medication for treating erectile dysfunction (ED) in men. It helps increase blood flow to the penis, allowing for a firm and sustained erection during sexual stimulation. Originally developed for heart-related chest pain, Sildenafil was later approved for ED treatment and has since transformed men’s sexual health worldwide.

What is Viagra (Sildenafil)?

Viagra belongs to a group of medications known as PDE5 inhibitors. It works by relaxing the blood vessels in the penis, improving blood flow when a man is sexually aroused. This action helps achieve and maintain an erection.

How Does Viagra Work?

Sildenafil blocks the enzyme phosphodiesterase type 5 (PDE5). By inhibiting PDE5, it increases levels of cyclic guanosine monophosphate (cGMP), which relaxes smooth muscles and allows more blood to enter the penile tissue. This process only works with sexual stimulation.

Approved Uses of Viagra

Erectile Dysfunction (ED): Helps men get and keep erections.
Pulmonary Arterial Hypertension (under brand name Revatio): Used in a different dose and formulation to improve exercise capacity.

Dosage and Administration

Common Starting Dose: 50 mg taken about 30 to 60 minutes before sexual activity.
Range: 25 mg to 100 mg depending on individual response and tolerance.
Important: Should not be taken more than once a day.

Take Viagra on an empty stomach for faster results. High-fat meals can delay its effectiveness.

How Long Does Viagra Last?

Viagra usually starts working within 30–60 minutes and can last up to 4 hours. However, this does not mean an erection will last that long—just that the window of effectiveness is open during that time.

Common Side Effects

Headache
Flushing
Nasal congestion
Indigestion
Dizziness
Vision changes (e.g., blue-tinted vision)

Most side effects are mild and temporary. Contact a doctor if they persist or worsen.

Serious Side Effects (Seek Immediate Help)

Chest pain
Shortness of breath
Sudden vision or hearing loss
Prolonged or painful erection (priapism)

Warnings and Precautions

Heart conditions: Avoid if advised against sexual activity.
Nitrates: Do not use Viagra with nitrate medications (for chest pain).
Alcohol: May increase side effects like dizziness and lower blood pressure.
Other ED drugs: Avoid combining with other PDE5 inhibitors.

Can Women Take Viagra?

Viagra is not approved for women, though research is ongoing. A different medication, Addyi, is sometimes prescribed for female sexual interest disorder.

Natural Alternatives to Viagra

While not as fast-acting, lifestyle changes like regular exercise, healthy eating, and stress reduction can support long-term sexual health. Some herbs like ginseng, L-arginine, and yohimbine are also studied, but not FDA-approved for ED.

Frequently Asked Questions (FAQs)

Q1: Is Viagra safe?
Yes, when used as prescribed. Always consult your doctor.

Q2: Can I take Viagra with food?
Yes, but a heavy or fatty meal may slow its absorption.

Q3: Is generic Viagra available?
Yes, generic Sildenafil is widely available and more affordable.

Final Thoughts

Viagra has helped millions of men overcome erectile dysfunction. While it’s not a cure, it provides a reliable and medically approved solution. Always consult a healthcare provider before starting Viagra, especially if you have other health conditions or take medications.

Sources / Scientific References:

FDA. “Viagra (Sildenafil) Information.” https://www.fda.gov
Mayo Clinic. “Sildenafil (Oral Route).” https://www.mayoclinic.org/drugs-supplements/sildenafil-oral-route
MedlinePlus. “Sildenafil.” https://medlineplus.gov/druginfo/meds/a699015.html
Cleveland Clinic. “How Does Viagra Work?” https://my.clevelandclinic.org
PubMed Central. “Sildenafil in the treatment of erectile dysfunction.” https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470658/