Question: is this a 2) strong advice, 1) weak advice 0) no advice?

However, this approach has been found to be often inadequate to attain long-term benefit (Keller and Boland, 1998; Montgomery and Kasper, 1998) and drugs that can be recommended for prophylaxis should offer good long-term tolerability at the full therapeutic dose. 
user
This is a strong advice
assistant