Here's how Viagra works step-by-step:
1. Sexual stimulation: Viagra is not a sexual stimulant. It only works when a man is sexually aroused.
2. Penile erection: During sexual stimulation, the blood vessels in the penis relax and widen, allowing more blood to flow into the penis. This causes an erection.
3. PDE5 inhibition: Viagra blocks an enzyme called phosphodiesterase type 5 (PDE5). PDE5 breaks down a chemical called cyclic guanosine monophosphate (cGMP). cGMP relaxes the blood vessels in the penis. By blocking PDE5, Viagra increases the levels of cGMP in the penis.
4. Increased blood flow to the penis: The increased levels of cGMP relax the blood vessels in the penis, allowing more blood to flow into the penis.
5. Erection: The increased blood flow to the penis causes an erection. Viagra does not directly cause an erection. It simply helps men achieve and maintain an erection during sexual stimulation.
Viagra is effective in treating erectile dysfunction in most men. However, it does not work for everyone. If you are not sure whether Viagra is right for you, talk to your doctor.
Here are some important things to know about Viagra:
* It is not a cure for erectile dysfunction.
* It only works when a man is sexually aroused.
* It does not protect against sexually transmitted infections (STIs).
* It can cause side effects, such as headaches, flushing, and upset stomach.
* It is not safe for everyone. If you have heart problems or other medical conditions, talk to your doctor before taking Viagra.
Viagra is a safe and effective treatment for erectile dysfunction when taken as directed by your doctor.
