Sildenafil (often called Viagra) is a medicine most people use to treat erectile dysfunction (ED). It helps increase blood flow to the penis so you can get and keep an erection when sexually stimulated. It's not an aphrodisiac — you still need sexual arousal for it to work.
Sildenafil blocks an enzyme (PDE5) that restricts blood flow during sexual activity. People usually feel effects within 30–60 minutes, and the effect can last up to about four hours. Typical tablet strengths are 25 mg, 50 mg, and 100 mg. Many start at 50 mg and adjust up or down based on effectiveness and side effects. If you’re over 65 or take certain medicines, doctors often recommend a lower starting dose.
Take sildenafil on an empty stomach for faster action. A heavy, fatty meal can slow how quickly it works. Do not take it more than once in 24 hours.
Common side effects: headache, flushing, nasal congestion, upset stomach, and dizziness. A less common but important effect is a temporary change in color vision (blue tint) or increased light sensitivity. If you get a long-lasting erection (over 4 hours), sudden vision loss, or severe chest pain, get emergency care.
Never take sildenafil with nitrate drugs (often used for chest pain) — together they can cause a dangerous drop in blood pressure. Avoid combining it with riociguat. Tell your doctor about blood pressure meds, alpha-blockers, certain antifungals, and some antibiotics; these can change how sildenafil acts or increase side effects. If you have heart disease, recent stroke, very low blood pressure, or severe liver disease, your doctor may advise against it.
Alcohol in moderation usually won’t stop sildenafil from working, but heavy drinking can reduce effectiveness and raise side effect risk. Recreational drugs that affect blood pressure are a bad mix with sildenafil.
If you plan to buy sildenafil online, use a licensed pharmacy that requires a prescription. Look for clear contact info, a real pharmacist available by phone, and secure payment. Avoid sites that sell without asking for any medical info — that’s a red flag. Read recent user reviews and check for proper shipping and return policies.
Compare prices but don’t chase the cheapest option if it means skipping a prescription or buying from an unverified source. Generic sildenafil is common and usually much cheaper than brand-name pills, but quality still matters.
Have questions about dosage or interactions? Talk to your prescriber or pharmacist. They can help adjust dose, check medicines you already take, and recommend safe suppliers. Sildenafil can work well when used correctly — being informed is the best way to get results and stay safe.
The Triple Trial Pack offers a careful selection of popular ED medications: Sildenafil, Tadalafil, and Vardenafil. In this article, learn about the medical and side effects as well as drug interactions of these substances. Discover common dosages and important recommendations to ensure safe use. We provide tips and insights to make the most out of your experience with the Triple Trial Pack.