Viagra side effects
Viagra · sildenafil · by Pfizer
Reviewed by the glpzoom Editorial Team against primary clinical sources — FDA labeling, peer-reviewed trials, and specialty-society guidelines.
Content current as of June 2026; updated when guidance or availability changes.
Headache (10-15%), flushing, nasal congestion, mild visual changes (slight blue tint). Stop and seek care for chest pain, sudden vision loss, or hearing loss.
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People also ask
Frequently asked
What are the most common Viagra side effects?+
Headache (10-15%), flushing, nasal congestion, mild visual changes (slight blue tint). Stop and seek care for chest pain, sudden vision loss, or hearing loss.
How long do Viagra side effects last?+
Most GI side effects (nausea, constipation) peak in the first 4-8 weeks of dose escalation and improve as the body adapts. Severe or persistent symptoms warrant a clinician call.
When should I stop Viagra?+
Stop and contact a clinician for severe abdominal pain, persistent vomiting, signs of pancreatitis, gallbladder symptoms, or any reaction outside the expected GI profile.