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What should I avoid while taking sildenafil?
temporary blue tint in vision or other vision abnormalities; or itching or a rash.
prolonged or severe dizziness; a prolonged (lasting longer than 4 hours) or painful erection; or
Symptoms of a sildenafil overdose are not known, but are likely to include chest pain, dizziness, an irregular heartbeat, and swelling of the ankles or legs.