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Sildenafil inhibits the PDE5 enzyme, which normally breaks down cyclic GMP in penile smooth muscle. By blocking this enzyme, sildenafil allows blood vessels in the penis to relax and fill with blood during sexual stimulation, producing an erection. It does not cause an erection on its own, sexual arousal is still required.

Viagra typically begins working within 30 to 60 minutes of taking it. The effects can last up to 4 to 6 hours, though the window of effectiveness varies by individual. Taking it on an empty stomach may speed onset, while a high-fat meal can delay it.

The standard recommended starting dose is 50 mg, taken as needed roughly one hour before sexual activity. Based on your response and tolerability, your physician may adjust the dose to 25 mg or 100 mg. The maximum recommended dose is 100 mg per day.

Viagra is contraindicated in men who take nitrate medications (such as nitroglycerin or isosorbide) for chest pain, as the combination can cause a dangerous drop in blood pressure. It is also not recommended for men with severe heart or liver disease, a recent stroke or heart attack, very low blood pressure, or certain hereditary retinal conditions. Your Doctronic physician will review your health history before prescribing.

Common side effects include headache, facial flushing, nasal congestion, indigestion, and mild temporary changes in color vision (a blue tint). Most side effects are mild and short-lived. Rarely, men may experience sudden vision or hearing loss, or a prolonged erection (priapism) lasting more than four hours, which requires immediate medical attention.

Moderate alcohol consumption may be acceptable, but drinking heavily can worsen side effects such as low blood pressure, dizziness, and impaired erection quality. Sildenafil can interact with alpha-blockers, certain antifungals, HIV protease inhibitors, and other blood-pressure medications. Always disclose all medications and supplements to your physician before starting Viagra.

Doctronic uses an AI-powered evaluation to gather your symptoms, health history, and medication list. A licensed physician then reviews your information, makes a clinical determination, and, if appropriate, creates a personalized treatment plan including a prescription. The entire process is designed to be fast, thorough, and convenient.

Yes. Doctronic connects you with fully licensed U.S. physicians who review and approve every treatment plan. The platform is HIPAA-compliant, and all clinical decisions are doctor-reviewed and audited to ensure your safety. Doctronic is available to adults 18 and older in any U.S. state.