Is the risk dose-related?

A 45-year-old man has a 10-year account of migraine without aura occurring about once a week relieved by an oral triptan.
When he sought communication for erectile dysfunction from a urologist, the side consequence of triggering migraine was brought up.
Now the affected role and the urologist want my judicial decision about whether the participant role should try an oral phosphodiesterase-5 inhibitor (PDE-5) and, if so, do I have a choice?Questions What is the risk of PDE-5 triggering migraines?
Does the risk vary among the trio medications, sildenafil (Viagra), vardenafil (Levitra), and tadalafil (Cialis)?

What is the potentiality from taking the PDE-5 drug until operation of the worry?
Would taking a migraine symptomatic therapy along with the PDE-5 inhibitor prevent the migraine from occurring?
Does the long-duration semantic role, cialis , causa long-duration migraines?
Do PDE-5-triggered migraines respond to the patient’s usual acute migraine medications?
Are encumbrance medications useful in loss the risk of PDE-5-triggered migraines?
How might PDE-5 inhibitors causal agency migraine?
Army unit 1 of 2 Case Continuum Submitted by Randolph W.
Archaeologist, MD ; Expert Substance by C.
This is a part of article Is the risk dose-related? Taken from "Levitra Versus Viagra" Information Blog