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Sildenafil inhibits PDE5, an enzyme that breaks down cyclic GMP in penile smooth muscle. By blocking this enzyme, sildenafil allows blood vessels to relax and widen, increasing blood flow to the penis and helping produce an erection when you are sexually aroused.

Viagra is typically taken 30 to 60 minutes before sexual activity. Its effects last approximately 4 to 6 hours. Taking it on an empty stomach or with a light meal generally produces the best results, as a high-fat meal can slow absorption.

Viagra is generally prescribed as an on-demand medication rather than a daily one. However, your physician will determine the appropriate dosing schedule based on your health profile and frequency of use. Tadalafil (Cialis) is an alternative that can be prescribed for once-daily use.

Common side effects include headache, facial flushing, nasal congestion, indigestion, and temporary changes in vision such as a blue-green tinge. Most side effects are mild and short-lived. Seek immediate medical attention if you experience a prolonged erection lasting more than 4 hours or sudden vision or hearing loss.

Sildenafil must not be taken with nitrate medications such as nitroglycerin, as the combination can cause a dangerous drop in blood pressure. It should also be used cautiously with alpha-blockers and certain antifungals or antibiotics that affect how the drug is metabolized. Always disclose all medications to your physician.

Viagra treats the symptoms of erectile dysfunction but does not cure the underlying cause. Stopping the medication means erections may become more difficult again. Lifestyle factors such as exercise, weight management, reduced alcohol intake, and managing conditions like diabetes or hypertension can improve erectile function over time.

Doctronic uses an AI-powered evaluation to gather your symptoms and health history, which is then reviewed by a licensed physician. The physician determines whether a refill or new prescription is appropriate and creates a personalized treatment plan. Everything is handled online with no in-person visit required.

Yes. Doctronic works exclusively with licensed physicians who are doctor-reviewed and practice under rigorous clinical standards. The platform is HIPAA-compliant, keeping your health information private and secure. Doctronic is available to adults 18 and older in any U.S. state.