Sildenafil is a medicine most people know for treating erectile dysfunction (ED). It also treats pulmonary arterial hypertension (PAH) in a different dosing form. Want to know how to use it safely, what side effects to expect, and how to buy it without getting scammed? Read on — this guide keeps things practical and simple.
Sildenafil relaxes blood vessels by blocking an enzyme called PDE5. For ED, typical starting dose is 50 mg taken 30–60 minutes before sex. Doctors may lower it to 25 mg or raise it to 100 mg based on how you respond and any side effects. For PAH (branded as Revatio), the usual adult dose is 20 mg three times a day. Never take more than the prescribed amount, and don’t take it more than once daily for ED unless your doctor says otherwise.
Timing matters: sexual stimulation is still needed for the drug to work. If you eat a heavy fatty meal right before taking sildenafil, it may take longer to start working. Avoid excessive alcohol — it can reduce effectiveness and increase dizziness.
Common side effects are headache, flushing, nasal congestion, indigestion, and sometimes temporary visual changes (like a blue tint). A rare but serious issue is priapism — an erection lasting more than four hours. If that happens, get emergency care right away.
Watch out for dangerous drug interactions. Don’t take sildenafil if you’re on nitrates (used for chest pain) — the combo can cause a severe drop in blood pressure. Be cautious with alpha-blockers, some antifungals, and HIV protease inhibitors — these can raise sildenafil levels. Grapefruit or grapefruit juice may increase drug levels too. If you have recent heart attack, unstable angina, very low blood pressure, or severe liver disease, talk to your doctor before using sildenafil.
Always tell your prescriber about other meds, supplements, and health conditions. If something feels off after taking sildenafil, stop and contact a healthcare professional.
Buying meds online can save money, but safety comes first. Use licensed pharmacies that require a prescription and list contact details and a licensed pharmacist. Look for clear return, privacy, and shipping policies. Avoid sites that sell sildenafil without asking for a prescription — that’s a red flag.
Compare prices but beware extremely low offers; counterfeit pills exist. Check customer reviews and third-party accreditation when available. If ordering from another country, know your local import rules and expect possible customs checks. Generic sildenafil (sildenafil citrate) is common and usually cheaper but should come from a reputable supplier.
Questions about dosage, side effects, or interactions? Ask your prescriber or pharmacist. Treat sildenafil like any prescription drug: it can help a lot when used correctly, and it can cause harm when misused.
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