Description
- Viagra does not sexually arouse a man. It only works if a man is sexually stimulated.
- When you get aroused sexually, the nervous system in your penis’s erectile tissue releases nitric oxide (NO).
- The nitric oxide stimulates an enzyme that produces something called a messenger cyclic guanosine monophosphate (cGMP).
- The cGMP relaxes the smooth muscle cells. One result of this is that the arteries in your penis dilate and the blood can flow into your penis more easily.
- Another result is that the erectile tissue itself fills with blood. Both of these process result in an erection.
WARNING
Side effects that you should report to your prescriber or health care professional as soon as possible.
- back pain
- changes in hearing such as loss of hearing or ringing in ears
- changes in vision such as loss of vision, blurred vision, eyes being more sensitive to light, or trouble telling the difference between blue and green objects or objects having a blue color tinge to them
- chest pain or palpitations
- difficulty breathing, shortness of breath
- dizziness
- eyelid swelling
- muscle aches
- prolonged erection (lasting longer than 4 hours)
- skin rash, itching
- seizures
