If you didn't drink then your sobriety is not effected. Taking medication for any illness as prescribed by a qualified physician does not change your sobriety time. I've been sober nearly 4 yrs and I take anxiety medication, I generally take less than the prescribed amount, w/o the medication I would have a lot more difficulty functioning in social situations and quite possibly would be more at risk of spoiling my sobriety.
I take Clonazepam which I believe is the same as Klonopin and initially it did make me a bit "loopy" but that didn't last long.