Sildenafil Citrate – What It Is and How It Works

If you’ve heard the name sildenafil citrate, you probably know it’s the active ingredient in Viagra. It belongs to a class of drugs called PDE5 inhibitors, which help blood flow into the penis during sexual arousal. The result is a firmer, longer-lasting erection when you’re sexually stimulated.

Unlike a hormone, sildenafil doesn’t create desire. It simply improves the body’s natural response to sexual cues. That’s why doctors prescribe it only when there’s a clear medical need, such as erectile dysfunction (ED) or pulmonary arterial hypertension.

Common Uses and Recommended Dosage

Most men take sildenafil for ED. The typical starting dose is 50 mg taken about an hour before sexual activity. You can adjust the dose to 25 mg or 100 mg based on how you feel and any side effects you notice. Don’t take more than one dose per day.

If a doctor prescribes it for pulmonary hypertension, the dosage is lower—usually 20 mg three times a day—and the timing is spread throughout the day.

Take the tablet with water, not with a heavy meal. High‑fat meals can slow absorption and make the drug less effective. Also, limit alcohol; a few drinks won’t hurt, but too much can reduce the erection quality and increase side effects.

Side Effects, Interactions, and Safety Tips

The most common side effects are mild and go away on their own: headache, flushing, upset stomach, or a brief blue‑tinted vision. If you get a painful erection that lasts longer than four hours (priapism), seek medical help right away.

Sildenafil can’t be mixed with certain medications, especially nitrates used for chest pain. Combining them can cause a dangerous drop in blood pressure. Talk to your pharmacist or doctor about any heart meds, blood pressure pills, or recreational drugs you’re using.

People with severe heart problems, recent strokes, or low blood pressure should avoid sildenafil unless a doctor says it’s safe. If you have liver or kidney disease, the dose may need adjustment.

When buying online, stick to licensed pharmacies that require a prescription. Look for a clear privacy policy, a valid pharmacy license number, and contact details. Avoid sites that offer “no‑prescription” sales or unbelievably low prices—those are often counterfeit and can be harmful.

In short, sildenafil citrate works well for many men with ED when used responsibly. Follow the prescribed dose, watch for side effects, and choose a reputable online pharmacy if you need a refill. With the right approach, you’ll get the benefits without unnecessary risks.