Fildena CT 100, best known by the brand name Viagra, is one of the most widely prescribed medications for treating erectile dysfunction (ED) in men. Since its FDA approval in 1998, it has helped millions regain confidence, restore intimacy, and improve sexual function. But how does sildenafil work, and what should you know before taking it? This guide explains the science behind the medication, its benefits, side effects, and safe usage.
What Is Sildenafil?
Sildenafil is a medication originally developed to treat high blood pressure and angina (chest pain). During clinical trials, researchers discovered a surprising side effect—it significantly improved erections in men with ED. As a result, sildenafil was repurposed for sexual health and marketed as Viagra. It’s also sold under other brand names and as a generic.
Sildenafil belongs to a class of drugs called PDE5 inhibitors (phosphodiesterase type 5 inhibitors), which improve blood flow in the body—especially to the penis.
How Does Sildenafil Work?
Erections occur when blood flows into the penis in response to sexual arousal. However, in men with ED, this process is disrupted—either due to physical, psychological, or vascular reasons.
Here’s how sildenafil helps:
Enhances blood flow: Sildenafil blocks the enzyme PDE5, which normally breaks down a molecule called cGMP. This molecule relaxes smooth muscles and dilates blood vessels.
Supports erection response: With PDE5 blocked, cGMP levels rise, leading to relaxed muscles and increased blood flow to the penis when a man is sexually aroused.
Does not cause automatic erections: Sildenafil does not work like an aphrodisiac. Sexual stimulation is still required for it to be effective.
When and How to Take Sildenafil
Timing: Sildenafil should be taken 30 to 60 minutes before sexual activity. Its effects can last up to 4 to 6 hours.
Dosage: Common doses range from 25 mg to 100 mg, depending on your health condition and response to the drug. The maximum recommended dose is 100 mg per day.
Food interactions: A heavy or high-fat meal may delay the drug’s absorption and reduce its effectiveness.
Alcohol: Limit alcohol consumption, as it can impair sexual function and increase side effects like dizziness or low blood pressure.
Who Can Benefit from Sildenafil?
Sildenafil is primarily prescribed for men with erectile dysfunction, but it may also be used to treat pulmonary arterial hypertension (under the brand name Revatio). It’s ideal for men who:
Have difficulty achieving or maintaining erections
Experience performance anxiety
Have blood vessel-related ED due to diabetes, hypertension, or smoking
However, it’s not suitable for men with certain heart conditions, those taking nitrates, or individuals with a history of stroke or severe low blood pressure.
Possible Side Effects
While generally well-tolerated, sildenafil can cause mild to moderate side effects, including:
Headache
Flushing (redness in the face)
Nasal congestion
Indigestion
Dizziness
Vision changes (blue-tinted vision or light sensitivity)
Rare but serious side effects may include:
Chest pain
Sudden hearing or vision loss
Prolonged erections (lasting more than 4 hours, also known as priapism)
Seek immediate medical help if you experience any of these.
Precautions and Interactions
Before taking sildenafil, inform your doctor if you:
Take heart or blood pressure medications
Have liver or kidney issues
Are taking alpha-blockers
Have eye disorders or are at risk of retinal disease
Combining sildenafil with nitrates (used for chest pain) can cause a dangerous drop in blood pressure and should be avoided.
Final Thoughts
Sildenafil has revolutionized the treatment of erectile dysfunction, offering men a safe and effective option to improve their sexual health. Understanding how it works allows users to take it responsibly and get the most out of their experience. Always follow your healthcare provider’s guidance to ensure safe and effective use.
When used correctly, sildenafil can restore more than just physical function—it can help bring back confidence, intimacy, and a satisfying sex life.
