Is Fildena 150 mg safe and effective for erectile dysfunction?

I’ve been prescribed Fildena 150 mg (sildenafil citrate) for erectile dysfunction and would like to know more about it.

Is 150 mg a safe dosage for regular use?

How long does it usually take to work and how long do the effects last?

What are the common side effects, and when should I be concerned?

Can it be taken with food or alcohol?

Who should avoid using Fildena 150 mg?

Any guidance from healthcare professionals or people with experience would be appreciated.