The half-life of Klonopin is 50 hours, duration of action is 12 hours for as-needed use, 12-18 hours for single daily
use,
and 18 hours for twice daily dosing.
Paxil targets 5-HT (serotonin) receptor sites,
and nine months was a prolonged period of use. Ideally, the Paxil should've been withdrawn very gradually. Of the SSRI's, Paxil carries the highest risk of withdrawal phenomena. Reports indicate that it may be severe.