Do you really grow tolerance to Cialis / Viagra or is it a meme?

[Avengere]

People say after some time Viagra / Sildenafil grows tolerance and you need ever larger doses and it stops working,

Is this true or a meme?

If it is true - in which scientific studies has it proven to be true?

If it is false - why people keep saying it is true?

Don't men just age and get worse libidos in general due to testosterone reduction?

 

[DLD]

No there is no physical dependency on either of those medications. There can be a psychological dependence but that’s not real.